Apply arrow function transform.

_arrayLikeKeys.js

@@ -32,13 +32,12 @@ function arrayLikeKeys(value, inherited) {
     if ((inherited || hasOwnProperty.call(value, key)) &&
         !(skipIndexes && (
            // Safari 9 has enumerable `arguments.length` in strict mode.
-           key == 'length' ||
+           (key == 'length' ||
            // Node.js 0.10 has enumerable non-index properties on buffers.
            (isBuff && (key == 'offset' || key == 'parent')) ||
            // PhantomJS 2 has enumerable non-index properties on typed arrays.
-           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
+           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) || // Skip index properties.
-           // Skip index properties.
+           isIndex(key, length))
-           isIndex(key, length)
         ))) {
       result.push(key);
     }

_baseClone.js

@@ -139,7 +139,7 @@ function baseClone(value, bitmask, customizer, key, object, stack) {
     : (isFlat ? keysIn : keys);
 
   var props = isArr ? undefined : keysFunc(value);
-  arrayEach(props || value, function(subValue, key) {
+  arrayEach(props || value, (subValue, key) => {
     if (props) {
       key = subValue;
       subValue = value[key];

_baseInverter.js

@@ -12,7 +12,7 @@ import baseForOwn from './_baseForOwn.js';
  * @returns {Function} Returns `accumulator`.
  */
 function baseInverter(object, setter, iteratee, accumulator) {
-  baseForOwn(object, function(value, key, object) {
+  baseForOwn(object, (value, key, object) => {
     setter(accumulator, iteratee(value), key, object);
   });
   return accumulator;

_baseMatches.js

@@ -14,9 +14,7 @@ function baseMatches(source) {
   if (matchData.length == 1 && matchData[0][2]) {
     return matchesStrictComparable(matchData[0][0], matchData[0][1]);
   }
-  return function(object) {
+  return object => object === source || baseIsMatch(object, source, matchData);
-    return object === source || baseIsMatch(object, source, matchData);
-  };
 }
 
 export default baseMatches;

_baseMatchesProperty.js

@@ -22,7 +22,7 @@ function baseMatchesProperty(path, srcValue) {
   if (isKey(path) && isStrictComparable(srcValue)) {
     return matchesStrictComparable(toKey(path), srcValue);
   }
-  return function(object) {
+  return object => {
     var objValue = get(object, path);
     return (objValue === undefined && objValue === srcValue)
       ? hasIn(object, path)

_baseOrderBy.js

@@ -19,16 +19,12 @@ function baseOrderBy(collection, iteratees, orders) {
   var index = -1;
   iteratees = arrayMap(iteratees.length ? iteratees : [identity], baseUnary(baseIteratee));
 
-  var result = baseMap(collection, function(value, key, collection) {
+  var result = baseMap(collection, (value, key, collection) => {
-    var criteria = arrayMap(iteratees, function(iteratee) {
+    var criteria = arrayMap(iteratees, iteratee => iteratee(value));
-      return iteratee(value);
-    });
     return { 'criteria': criteria, 'index': ++index, 'value': value };
   });
 
-  return baseSortBy(result, function(object, other) {
+  return baseSortBy(result, (object, other) => compareMultiple(object, other, orders));
-    return compareMultiple(object, other, orders);
-  });
 }
 
 export default baseOrderBy;

_basePick.js

@@ -11,9 +11,7 @@ import hasIn from './hasIn.js';
  * @returns {Object} Returns the new object.
  */
 function basePick(object, paths) {
-  return basePickBy(object, paths, function(value, path) {
+  return basePickBy(object, paths, (value, path) => hasIn(object, path));
-    return hasIn(object, path);
-  });
 }
 
 export default basePick;

_baseProperty.js

@@ -6,9 +6,7 @@
  * @returns {Function} Returns the new accessor function.
  */
 function baseProperty(key) {
-  return function(object) {
+  return object => object == null ? undefined : object[key];
-    return object == null ? undefined : object[key];
-  };
 }
 
 export default baseProperty;

_basePropertyDeep.js

@@ -8,9 +8,7 @@ import baseGet from './_baseGet.js';
  * @returns {Function} Returns the new accessor function.
  */
 function basePropertyDeep(path) {
-  return function(object) {
+  return object => baseGet(object, path);
-    return baseGet(object, path);
-  };
 }
 
 export default basePropertyDeep;

_basePropertyOf.js

@@ -6,9 +6,7 @@
  * @returns {Function} Returns the new accessor function.
  */
 function basePropertyOf(object) {
-  return function(key) {
+  return key => object == null ? undefined : object[key];
-    return object == null ? undefined : object[key];
-  };
 }
 
 export default basePropertyOf;

_baseReduce.js

@@ -12,7 +12,7 @@
  * @returns {*} Returns the accumulated value.
  */
 function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
-  eachFunc(collection, function(value, index, collection) {
+  eachFunc(collection, (value, index, collection) => {
     accumulator = initAccum
       ? (initAccum = false, value)
       : iteratee(accumulator, value, index, collection);

_baseSetData.js

@@ -9,7 +9,7 @@ import metaMap from './_metaMap.js';
  * @param {*} data The metadata.
  * @returns {Function} Returns `func`.
  */
-var baseSetData = !metaMap ? identity : function(func, data) {
+var baseSetData = !metaMap ? identity : (func, data) => {
   metaMap.set(func, data);
   return func;
 };

_baseSetToString.js

@@ -10,13 +10,11 @@ import identity from './identity.js';
  * @param {Function} string The `toString` result.
  * @returns {Function} Returns `func`.
  */
-var baseSetToString = !defineProperty ? identity : function(func, string) {
+var baseSetToString = !defineProperty ? identity : (func, string) => defineProperty(func, 'toString', {
-  return defineProperty(func, 'toString', {
+  'configurable': true,
-    'configurable': true,
+  'enumerable': false,
-    'enumerable': false,
+  'value': constant(string),
-    'value': constant(string),
+  'writable': true
-    'writable': true
+});
-  });
-};
 
 export default baseSetToString;

_baseSome.js

@@ -12,7 +12,7 @@ import baseEach from './_baseEach.js';
 function baseSome(collection, predicate) {
   var result;
 
-  baseEach(collection, function(value, index, collection) {
+  baseEach(collection, (value, index, collection) => {
     result = predicate(value, index, collection);
     return !result;
   });

_baseToPairs.js

@@ -10,9 +10,7 @@ import arrayMap from './_arrayMap.js';
  * @returns {Object} Returns the key-value pairs.
  */
 function baseToPairs(object, props) {
-  return arrayMap(props, function(key) {
+  return arrayMap(props, key => [key, object[key]]);
-    return [key, object[key]];
-  });
 }
 
 export default baseToPairs;

_baseUnary.js

@@ -6,9 +6,7 @@
  * @returns {Function} Returns the new capped function.
  */
 function baseUnary(func) {
-  return function(value) {
+  return value => func(value);
-    return func(value);
-  };
 }
 
 export default baseUnary;

_baseValues.js

@@ -11,9 +11,7 @@ import arrayMap from './_arrayMap.js';
  * @returns {Object} Returns the array of property values.
  */
 function baseValues(object, props) {
-  return arrayMap(props, function(key) {
+  return arrayMap(props, key => object[key]);
-    return object[key];
-  });
 }
 
 export default baseValues;

_baseWrapperValue.js

@@ -17,9 +17,7 @@ function baseWrapperValue(value, actions) {
   if (result instanceof LazyWrapper) {
     result = result.value();
   }
-  return arrayReduce(actions, function(result, action) {
+  return arrayReduce(actions, (result, action) => action.func.apply(action.thisArg, arrayPush([result], action.args)), result);
-    return action.func.apply(action.thisArg, arrayPush([result], action.args));
-  }, result);
 }
 
 export default baseWrapperValue;

_createAggregator.js

@@ -12,7 +12,7 @@ import isArray from './isArray.js';
  * @returns {Function} Returns the new aggregator function.
  */
 function createAggregator(setter, initializer) {
-  return function(collection, iteratee) {
+  return (collection, iteratee) => {
     var func = isArray(collection) ? arrayAggregator : baseAggregator,
         accumulator = initializer ? initializer() : {};
 

_createAssigner.js

@@ -9,7 +9,7 @@ import isIterateeCall from './_isIterateeCall.js';
  * @returns {Function} Returns the new assigner function.
  */
 function createAssigner(assigner) {
-  return baseRest(function(object, sources) {
+  return baseRest((object, sources) => {
     var index = -1,
         length = sources.length,
         customizer = length > 1 ? sources[length - 1] : undefined,

_createBaseEach.js

@@ -9,7 +9,7 @@ import isArrayLike from './isArrayLike.js';
  * @returns {Function} Returns the new base function.
  */
 function createBaseEach(eachFunc, fromRight) {
-  return function(collection, iteratee) {
+  return (collection, iteratee) => {
     if (collection == null) {
       return collection;
     }

_createBaseFor.js

@@ -6,7 +6,7 @@
  * @returns {Function} Returns the new base function.
  */
 function createBaseFor(fromRight) {
-  return function(object, iteratee, keysFunc) {
+  return (object, iteratee, keysFunc) => {
     var index = -1,
         iterable = Object(object),
         props = keysFunc(object),

_createCaseFirst.js

@@ -11,7 +11,7 @@ import toString from './toString.js';
  * @returns {Function} Returns the new case function.
  */
 function createCaseFirst(methodName) {
-  return function(string) {
+  return string => {
     string = toString(string);
 
     var strSymbols = hasUnicode(string)

_createCompounder.js

@@ -16,9 +16,7 @@ var reApos = RegExp(rsApos, 'g');
  * @returns {Function} Returns the new compounder function.
  */
 function createCompounder(callback) {
-  return function(string) {
+  return string => arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
-    return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
-  };
 }
 
 export default createCompounder;

_createFind.js

@@ -10,12 +10,12 @@ import keys from './keys.js';
  * @returns {Function} Returns the new find function.
  */
 function createFind(findIndexFunc) {
-  return function(collection, predicate, fromIndex) {
+  return (collection, predicate, fromIndex) => {
     var iterable = Object(collection);
     if (!isArrayLike(collection)) {
       var iteratee = baseIteratee(predicate, 3);
       collection = keys(collection);
-      predicate = function(key) { return iteratee(iterable[key], key, iterable); };
+      predicate = key => iteratee(iterable[key], key, iterable);
     }
     var index = findIndexFunc(collection, predicate, fromIndex);
     return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;

_createFlow.js

@@ -22,7 +22,7 @@ var WRAP_CURRY_FLAG = 8,
  * @returns {Function} Returns the new flow function.
  */
 function createFlow(fromRight) {
-  return flatRest(function(funcs) {
+  return flatRest(funcs => {
     var length = funcs.length,
         index = length,
         prereq = LodashWrapper.prototype.thru;

_createInverter.js

@@ -9,9 +9,7 @@ import baseInverter from './_baseInverter.js';
  * @returns {Function} Returns the new inverter function.
  */
 function createInverter(setter, toIteratee) {
-  return function(object, iteratee) {
+  return (object, iteratee) => baseInverter(object, setter, toIteratee(iteratee), {});
-    return baseInverter(object, setter, toIteratee(iteratee), {});
-  };
 }
 
 export default createInverter;

_createMathOperation.js

@@ -10,7 +10,7 @@ import baseToString from './_baseToString.js';
  * @returns {Function} Returns the new mathematical operation function.
  */
 function createMathOperation(operator, defaultValue) {
-  return function(value, other) {
+  return (value, other) => {
     var result;
     if (value === undefined && other === undefined) {
       return defaultValue;

_createOver.js

@@ -13,13 +13,11 @@ import flatRest from './_flatRest.js';
  * @returns {Function} Returns the new over function.
  */
 function createOver(arrayFunc) {
-  return flatRest(function(iteratees) {
+  return flatRest(iteratees => {
     iteratees = arrayMap(iteratees, baseUnary(baseIteratee));
     return baseRest(function(args) {
       var thisArg = this;
-      return arrayFunc(iteratees, function(iteratee) {
+      return arrayFunc(iteratees, iteratee => apply(iteratee, thisArg, args));
-        return apply(iteratee, thisArg, args);
-      });
     });
   });
 }

_createRange.js

@@ -10,7 +10,7 @@ import toFinite from './toFinite.js';
  * @returns {Function} Returns the new range function.
  */
 function createRange(fromRight) {
-  return function(start, end, step) {
+  return (start, end, step) => {
     if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
       end = step = undefined;
     }

_createRelationalOperation.js

@@ -8,7 +8,7 @@ import toNumber from './toNumber.js';
  * @returns {Function} Returns the new relational operation function.
  */
 function createRelationalOperation(operator) {
-  return function(value, other) {
+  return (value, other) => {
     if (!(typeof value == 'string' && typeof other == 'string')) {
       value = toNumber(value);
       other = toNumber(other);

_createRound.js

@@ -14,7 +14,7 @@ var nativeMin = Math.min;
  */
 function createRound(methodName) {
   var func = Math[methodName];
-  return function(number, precision) {
+  return (number, precision) => {
     number = toNumber(number);
     precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
     if (precision) {

_createSet.js

@@ -12,8 +12,6 @@ var INFINITY = 1 / 0;
  * @param {Array} values The values to add to the set.
  * @returns {Object} Returns the new set.
  */
-var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
+var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : values => new Set(values);
-  return new Set(values);
-};
 
 export default createSet;

_createToPairs.js

@@ -15,7 +15,7 @@ var mapTag = '[object Map]',
  * @returns {Function} Returns the new pairs function.
  */
 function createToPairs(keysFunc) {
-  return function(object) {
+  return object => {
     var tag = getTag(object);
     if (tag == mapTag) {
       return mapToArray(object);

_defineProperty.js

@@ -1,11 +1,11 @@
 import getNative from './_getNative.js';
 
-var defineProperty = (function() {
+var defineProperty = ((() => {
   try {
     var func = getNative(Object, 'defineProperty');
     func({}, '', {});
     return func;
   } catch (e) {}
-}());
+})());
 
 export default defineProperty;

_equalArrays.js

@@ -58,7 +58,7 @@ function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
     }
     // Recursively compare arrays (susceptible to call stack limits).
     if (seen) {
-      if (!arraySome(other, function(othValue, othIndex) {
+      if (!arraySome(other, (othValue, othIndex) => {
             if (!cacheHas(seen, othIndex) &&
                 (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
               return seen.push(othIndex);

_getData.js

@@ -8,8 +8,6 @@ import noop from './noop.js';
  * @param {Function} func The function to query.
  * @returns {*} Returns the metadata for `func`.
  */
-var getData = !metaMap ? noop : function(func) {
+var getData = !metaMap ? noop : func => metaMap.get(func);
-  return metaMap.get(func);
-};
 
 export default getData;

_getSymbols.js

@@ -17,14 +17,12 @@ var nativeGetSymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
+var getSymbols = !nativeGetSymbols ? stubArray : object => {
   if (object == null) {
     return [];
   }
   object = Object(object);
-  return arrayFilter(nativeGetSymbols(object), function(symbol) {
+  return arrayFilter(nativeGetSymbols(object), symbol => propertyIsEnumerable.call(object, symbol));
-    return propertyIsEnumerable.call(object, symbol);
-  });
 };
 
 export default getSymbols;

_getSymbolsIn.js

@@ -13,7 +13,7 @@ var nativeGetSymbols = Object.getOwnPropertySymbols;
  * @param {Object} object The object to query.
  * @returns {Array} Returns the array of symbols.
  */
-var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
+var getSymbolsIn = !nativeGetSymbols ? stubArray : object => {
   var result = [];
   while (object) {
     arrayPush(result, getSymbols(object));

_getTag.js

@@ -37,7 +37,7 @@ if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
     (Promise && getTag(Promise.resolve()) != promiseTag) ||
     (Set && getTag(new Set) != setTag) ||
     (WeakMap && getTag(new WeakMap) != weakMapTag)) {
-  getTag = function(value) {
+  getTag = value => {
     var result = baseGetTag(value),
         Ctor = result == objectTag ? value.constructor : undefined,
         ctorString = Ctor ? toSource(Ctor) : '';

_isMasked.js

@@ -1,10 +1,10 @@
 import coreJsData from './_coreJsData.js';
 
 /** Used to detect methods masquerading as native. */
-var maskSrcKey = (function() {
+var maskSrcKey = ((() => {
   var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
   return uid ? ('Symbol(src)_1.' + uid) : '';
-}());
+})());
 
 /**
  * Checks if `func` has its source masked.

_mapToArray.js

@@ -9,7 +9,7 @@ function mapToArray(map) {
   var index = -1,
       result = Array(map.size);
 
-  map.forEach(function(value, key) {
+  map.forEach((value, key) => {
     result[++index] = [key, value];
   });
   return result;

_matchesStrictComparable.js

@@ -8,7 +8,7 @@
  * @returns {Function} Returns the new spec function.
  */
 function matchesStrictComparable(key, srcValue) {
-  return function(object) {
+  return object => {
     if (object == null) {
       return false;
     }

_memoizeCapped.js

@@ -12,7 +12,7 @@ var MAX_MEMOIZE_SIZE = 500;
  * @returns {Function} Returns the new memoized function.
  */
 function memoizeCapped(func) {
-  var result = memoize(func, function(key) {
+  var result = memoize(func, key => {
     if (cache.size === MAX_MEMOIZE_SIZE) {
       cache.clear();
     }

_nodeUtil.js

@@ -13,10 +13,10 @@ var moduleExports = freeModule && freeModule.exports === freeExports;
 var freeProcess = moduleExports && freeGlobal.process;
 
 /** Used to access faster Node.js helpers. */
-var nodeUtil = (function() {
+var nodeUtil = ((() => {
   try {
     return freeProcess && freeProcess.binding && freeProcess.binding('util');
   } catch (e) {}
-}());
+})());
 
 export default nodeUtil;

_overArg.js

@@ -7,9 +7,7 @@
  * @returns {Function} Returns the new function.
  */
 function overArg(func, transform) {
-  return function(arg) {
+  return arg => func(transform(arg));
-    return func(transform(arg));
-  };
 }
 
 export default overArg;

_setToArray.js

@@ -9,7 +9,7 @@ function setToArray(set) {
   var index = -1,
       result = Array(set.size);
 
-  set.forEach(function(value) {
+  set.forEach(value => {
     result[++index] = value;
   });
   return result;

_stringToPath.js

@@ -14,12 +14,12 @@ var reEscapeChar = /\\(\\)?/g;
  * @param {string} string The string to convert.
  * @returns {Array} Returns the property path array.
  */
-var stringToPath = memoizeCapped(function(string) {
+var stringToPath = memoizeCapped(string => {
   var result = [];
   if (reLeadingDot.test(string)) {
     result.push('');
   }
-  string.replace(rePropName, function(match, number, quote, string) {
+  string.replace(rePropName, (match, number, quote, string) => {
     result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
   });
   return result;

_updateWrapDetails.js

@@ -34,7 +34,7 @@ var wrapFlags = [
  * @returns {Array} Returns `details`.
  */
 function updateWrapDetails(details, bitmask) {
-  arrayEach(wrapFlags, function(pair) {
+  arrayEach(wrapFlags, pair => {
     var value = '_.' + pair[0];
     if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
       details.push(value);

add.js

@@ -15,8 +15,6 @@ import createMathOperation from './_createMathOperation.js';
  * _.add(6, 4);
  * // => 10
  */
-var add = createMathOperation(function(augend, addend) {
+var add = createMathOperation((augend, addend) => augend + addend, 0);
-  return augend + addend;
-}, 0);
 
 export default add;

assignIn.js

@@ -33,7 +33,7 @@ import keysIn from './keysIn.js';
  * _.assignIn({ 'a': 0 }, new Foo, new Bar);
  * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
  */
-var assignIn = createAssigner(function(object, source) {
+var assignIn = createAssigner((object, source) => {
   copyObject(source, keysIn(source), object);
 });
 

assignInWith.js

@@ -31,7 +31,7 @@ import keysIn from './keysIn.js';
  * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  * // => { 'a': 1, 'b': 2 }
  */
-var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
+var assignInWith = createAssigner((object, source, srcIndex, customizer) => {
   copyObject(source, keysIn(source), object, customizer);
 });
 

assignWith.js

@@ -30,7 +30,7 @@ import keys from './keys.js';
  * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  * // => { 'a': 1, 'b': 2 }
  */
-var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
+var assignWith = createAssigner((object, source, srcIndex, customizer) => {
   copyObject(source, keys(source), object, customizer);
 });
 

attempt.js

@@ -24,7 +24,7 @@ import isError from './isError.js';
  *   elements = [];
  * }
  */
-var attempt = baseRest(function(func, args) {
+var attempt = baseRest((func, args) => {
   try {
     return apply(func, undefined, args);
   } catch (e) {

bind.js

@@ -42,7 +42,7 @@ var WRAP_BIND_FLAG = 1,
  * bound('hi');
  * // => 'hi fred!'
  */
-var bind = baseRest(function(func, thisArg, partials) {
+var bind = baseRest((func, thisArg, partials) => {
   var bitmask = WRAP_BIND_FLAG;
   if (partials.length) {
     var holders = replaceHolders(partials, getHolder(bind));

bindAll.js

@@ -30,8 +30,8 @@ import toKey from './_toKey.js';
  * jQuery(element).on('click', view.click);
  * // => Logs 'clicked docs' when clicked.
  */
-var bindAll = flatRest(function(object, methodNames) {
+var bindAll = flatRest((object, methodNames) => {
-  arrayEach(methodNames, function(key) {
+  arrayEach(methodNames, key => {
     key = toKey(key);
     baseAssignValue(object, key, bind(object[key], object));
   });

bindKey.js

@@ -53,7 +53,7 @@ var WRAP_BIND_FLAG = 1,
  * bound('hi');
  * // => 'hiya fred!'
  */
-var bindKey = baseRest(function(object, key, partials) {
+var bindKey = baseRest((object, key, partials) => {
   var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
   if (partials.length) {
     var holders = replaceHolders(partials, getHolder(bindKey));

camelCase.js

@@ -21,7 +21,7 @@ import createCompounder from './_createCompounder.js';
  * _.camelCase('__FOO_BAR__');
  * // => 'fooBar'
  */
-var camelCase = createCompounder(function(result, word, index) {
+var camelCase = createCompounder((result, word, index) => {
   word = word.toLowerCase();
   return result + (index ? capitalize(word) : word);
 });

cond.js

@@ -39,7 +39,7 @@ function cond(pairs) {
   var length = pairs == null ? 0 : pairs.length,
       toIteratee = baseIteratee;
 
-  pairs = !length ? [] : arrayMap(pairs, function(pair) {
+  pairs = !length ? [] : arrayMap(pairs, pair => {
     if (typeof pair[1] != 'function') {
       throw new TypeError(FUNC_ERROR_TEXT);
     }

constant.js

@@ -18,9 +18,7 @@
  * // => true
  */
 function constant(value) {
-  return function() {
+  return () => value;
-    return value;
-  };
 }
 
 export default constant;

countBy.js

@@ -29,7 +29,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * _.countBy(['one', 'two', 'three'], 'length');
  * // => { '3': 2, '5': 1 }
  */
-var countBy = createAggregator(function(result, value, key) {
+var countBy = createAggregator((result, value, key) => {
   if (hasOwnProperty.call(result, key)) {
     ++result[key];
   } else {

defaults.js

@@ -24,7 +24,7 @@ import customDefaultsAssignIn from './_customDefaultsAssignIn.js';
  * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  * // => { 'a': 1, 'b': 2 }
  */
-var defaults = baseRest(function(args) {
+var defaults = baseRest(args => {
   args.push(undefined, customDefaultsAssignIn);
   return apply(assignInWith, undefined, args);
 });

defaultsDeep.js

@@ -22,7 +22,7 @@ import mergeWith from './mergeWith.js';
  * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
  * // => { 'a': { 'b': 2, 'c': 3 } }
  */
-var defaultsDeep = baseRest(function(args) {
+var defaultsDeep = baseRest(args => {
   args.push(undefined, customDefaultsMerge);
   return apply(mergeWith, undefined, args);
 });

defer.js

@@ -19,8 +19,6 @@ import baseRest from './_baseRest.js';
  * }, 'deferred');
  * // => Logs 'deferred' after one millisecond.
  */
-var defer = baseRest(function(func, args) {
+var defer = baseRest((func, args) => baseDelay(func, 1, args));
-  return baseDelay(func, 1, args);
-});
 
 export default defer;

delay.js

@@ -21,8 +21,6 @@ import toNumber from './toNumber.js';
  * }, 1000, 'later');
  * // => Logs 'later' after one second.
  */
-var delay = baseRest(function(func, wait, args) {
+var delay = baseRest((func, wait, args) => baseDelay(func, toNumber(wait) || 0, args));
-  return baseDelay(func, toNumber(wait) || 0, args);
-});
 
 export default delay;

difference.js

@@ -24,10 +24,8 @@ import isArrayLikeObject from './isArrayLikeObject.js';
  * _.difference([2, 1], [2, 3]);
  * // => [1]
  */
-var difference = baseRest(function(array, values) {
+var difference = baseRest((array, values) => isArrayLikeObject(array)
-  return isArrayLikeObject(array)
+  ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
-    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
+  : []);
-    : [];
-});
 
 export default difference;

differenceBy.js

@@ -31,7 +31,7 @@ import last from './last.js';
  * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
  * // => [{ 'x': 2 }]
  */
-var differenceBy = baseRest(function(array, values) {
+var differenceBy = baseRest((array, values) => {
   var iteratee = last(values);
   if (isArrayLikeObject(iteratee)) {
     iteratee = undefined;

differenceWith.js

@@ -27,7 +27,7 @@ import last from './last.js';
  * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
  * // => [{ 'x': 2, 'y': 1 }]
  */
-var differenceWith = baseRest(function(array, values) {
+var differenceWith = baseRest((array, values) => {
   var comparator = last(values);
   if (isArrayLikeObject(comparator)) {
     comparator = undefined;

divide.js

@@ -15,8 +15,6 @@ import createMathOperation from './_createMathOperation.js';
  * _.divide(6, 4);
  * // => 1.5
  */
-var divide = createMathOperation(function(dividend, divisor) {
+var divide = createMathOperation((dividend, divisor) => dividend / divisor, 1);
-  return dividend / divisor;
-}, 1);
 
 export default divide;

groupBy.js

@@ -30,7 +30,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * _.groupBy(['one', 'two', 'three'], 'length');
  * // => { '3': ['one', 'two'], '5': ['three'] }
  */
-var groupBy = createAggregator(function(result, value, key) {
+var groupBy = createAggregator((result, value, key) => {
   if (hasOwnProperty.call(result, key)) {
     result[key].push(value);
   } else {

gte.js

@@ -23,8 +23,6 @@ import createRelationalOperation from './_createRelationalOperation.js';
  * _.gte(1, 3);
  * // => false
  */
-var gte = createRelationalOperation(function(value, other) {
+var gte = createRelationalOperation((value, other) => value >= other);
-  return value >= other;
-});
 
 export default gte;

intersection.js

@@ -20,7 +20,7 @@ import castArrayLikeObject from './_castArrayLikeObject.js';
  * _.intersection([2, 1], [2, 3]);
  * // => [2]
  */
-var intersection = baseRest(function(arrays) {
+var intersection = baseRest(arrays => {
   var mapped = arrayMap(arrays, castArrayLikeObject);
   return (mapped.length && mapped[0] === arrays[0])
     ? baseIntersection(mapped)

intersectionBy.js

@@ -28,7 +28,7 @@ import last from './last.js';
  * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
  * // => [{ 'x': 1 }]
  */
-var intersectionBy = baseRest(function(arrays) {
+var intersectionBy = baseRest(arrays => {
   var iteratee = last(arrays),
       mapped = arrayMap(arrays, castArrayLikeObject);
 

intersectionWith.js

@@ -25,7 +25,7 @@ import last from './last.js';
  * _.intersectionWith(objects, others, _.isEqual);
  * // => [{ 'x': 1, 'y': 2 }]
  */
-var intersectionWith = baseRest(function(arrays) {
+var intersectionWith = baseRest(arrays => {
   var comparator = last(arrays),
       mapped = arrayMap(arrays, castArrayLikeObject);
 

invert.js

@@ -20,7 +20,7 @@ import identity from './identity.js';
  * _.invert(object);
  * // => { '1': 'c', '2': 'b' }
  */
-var invert = createInverter(function(result, value, key) {
+var invert = createInverter((result, value, key) => {
   result[value] = key;
 }, constant(identity));
 

invertBy.js

@@ -33,7 +33,7 @@ var hasOwnProperty = objectProto.hasOwnProperty;
  * });
  * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
  */
-var invertBy = createInverter(function(result, value, key) {
+var invertBy = createInverter((result, value, key) => {
   if (hasOwnProperty.call(result, value)) {
     result[value].push(key);
   } else {

invokeMap.js

@@ -27,12 +27,12 @@ import isArrayLike from './isArrayLike.js';
  * _.invokeMap([123, 456], String.prototype.split, '');
  * // => [['1', '2', '3'], ['4', '5', '6']]
  */
-var invokeMap = baseRest(function(collection, path, args) {
+var invokeMap = baseRest((collection, path, args) => {
   var index = -1,
       isFunc = typeof path == 'function',
       result = isArrayLike(collection) ? Array(collection.length) : [];
 
-  baseEach(collection, function(value) {
+  baseEach(collection, value => {
     result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
   });
   return result;

isArguments.js

@@ -28,9 +28,7 @@ var propertyIsEnumerable = objectProto.propertyIsEnumerable;
  * _.isArguments([1, 2, 3]);
  * // => false
  */
-var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
+var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : value => isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
-  return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
+  !propertyIsEnumerable.call(value, 'callee');
-    !propertyIsEnumerable.call(value, 'callee');
-};
 
 export default isArguments;

kebabCase.js

@@ -21,8 +21,6 @@ import createCompounder from './_createCompounder.js';
  * _.kebabCase('__FOO_BAR__');
  * // => 'foo-bar'
  */
-var kebabCase = createCompounder(function(result, word, index) {
+var kebabCase = createCompounder((result, word, index) => result + (index ? '-' : '') + word.toLowerCase());
-  return result + (index ? '-' : '') + word.toLowerCase();
-});
 
 export default kebabCase;

keyBy.js

@@ -29,7 +29,7 @@ import createAggregator from './_createAggregator.js';
  * _.keyBy(array, 'dir');
  * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
  */
-var keyBy = createAggregator(function(result, value, key) {
+var keyBy = createAggregator((result, value, key) => {
   baseAssignValue(result, key, value);
 });
 

lodash.default.js

@@ -72,22 +72,20 @@ var nativeMax = Math.max,
     nativeMin = Math.min;
 
 // wrap `_.mixin` so it works when provided only one argument
-var mixin = (function(func) {
+var mixin = ((func => function(object, source, options) {
-  return function(object, source, options) {
+  if (options == null) {
-    if (options == null) {
+    var isObj = isObject(source),
-      var isObj = isObject(source),
+        props = isObj && keys(source),
-          props = isObj && keys(source),
+        methodNames = props && props.length && baseFunctions(source, props);
-          methodNames = props && props.length && baseFunctions(source, props);
 
-      if (!(methodNames ? methodNames.length : isObj)) {
+    if (!(methodNames ? methodNames.length : isObj)) {
-        options = source;
+      options = source;
-        source = object;
+      source = object;
-        object = this;
+      object = this;
-      }
     }
-    return func(object, source, options);
+  }
-  };
+  return func(object, source, options);
-}(_mixin));
+})(_mixin));
 
 // Add methods that return wrapped values in chain sequences.
 lodash.after = func.after;
@@ -403,15 +401,15 @@ lodash.each = collection.forEach;
 lodash.eachRight = collection.forEachRight;
 lodash.first = array.head;
 
-mixin(lodash, (function() {
+mixin(lodash, ((() => {
   var source = {};
-  baseForOwn(lodash, function(func, methodName) {
+  baseForOwn(lodash, (func, methodName) => {
     if (!hasOwnProperty.call(lodash.prototype, methodName)) {
       source[methodName] = func;
     }
   });
   return source;
-}()), { 'chain': false });
+})()), { 'chain': false });
 
 /**
  * The semantic version number.
@@ -424,12 +422,12 @@ lodash.VERSION = VERSION;
 (lodash.templateSettings = string.templateSettings).imports._ = lodash;
 
 // Assign default placeholders.
-arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
+arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], methodName => {
   lodash[methodName].placeholder = lodash;
 });
 
 // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
-arrayEach(['drop', 'take'], function(methodName, index) {
+arrayEach(['drop', 'take'], (methodName, index) => {
   LazyWrapper.prototype[methodName] = function(n) {
     n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
 
@@ -454,7 +452,7 @@ arrayEach(['drop', 'take'], function(methodName, index) {
 });
 
 // Add `LazyWrapper` methods that accept an `iteratee` value.
-arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
+arrayEach(['filter', 'map', 'takeWhile'], (methodName, index) => {
   var type = index + 1,
       isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
 
@@ -470,7 +468,7 @@ arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
 });
 
 // Add `LazyWrapper` methods for `_.head` and `_.last`.
-arrayEach(['head', 'last'], function(methodName, index) {
+arrayEach(['head', 'last'], (methodName, index) => {
   var takeName = 'take' + (index ? 'Right' : '');
 
   LazyWrapper.prototype[methodName] = function() {
@@ -479,7 +477,7 @@ arrayEach(['head', 'last'], function(methodName, index) {
 });
 
 // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
-arrayEach(['initial', 'tail'], function(methodName, index) {
+arrayEach(['initial', 'tail'], (methodName, index) => {
   var dropName = 'drop' + (index ? '' : 'Right');
 
   LazyWrapper.prototype[methodName] = function() {
@@ -503,9 +501,7 @@ LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
   if (typeof path == 'function') {
     return new LazyWrapper(this);
   }
-  return this.map(function(value) {
+  return this.map(value => baseInvoke(value, path, args));
-    return baseInvoke(value, path, args);
-  });
 });
 
 LazyWrapper.prototype.reject = function(predicate) {
@@ -540,7 +536,7 @@ LazyWrapper.prototype.toArray = function() {
 };
 
 // Add `LazyWrapper` methods to `lodash.prototype`.
-baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+baseForOwn(LazyWrapper.prototype, (func, methodName) => {
   var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
       isTaker = /^(?:head|last)$/.test(methodName),
       lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
@@ -556,7 +552,7 @@ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
         iteratee = args[0],
         useLazy = isLazy || isArray(value);
 
-    var interceptor = function(value) {
+    var interceptor = value => {
       var result = lodashFunc.apply(lodash, arrayPush([value], args));
       return (isTaker && chainAll) ? result[0] : result;
     };
@@ -585,7 +581,7 @@ baseForOwn(LazyWrapper.prototype, function(func, methodName) {
 });
 
 // Add `Array` methods to `lodash.prototype`.
-arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
+arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], methodName => {
   var func = arrayProto[methodName],
       chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
       retUnwrapped = /^(?:pop|shift)$/.test(methodName);
@@ -596,14 +592,12 @@ arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(method
       var value = this.value();
       return func.apply(isArray(value) ? value : [], args);
     }
-    return this[chainName](function(value) {
+    return this[chainName](value => func.apply(isArray(value) ? value : [], args));
-      return func.apply(isArray(value) ? value : [], args);
-    });
   };
 });
 
 // Map minified method names to their real names.
-baseForOwn(LazyWrapper.prototype, function(func, methodName) {
+baseForOwn(LazyWrapper.prototype, (func, methodName) => {
   var lodashFunc = lodash[methodName];
   if (lodashFunc) {
     var key = (lodashFunc.name + ''),

lowerCase.js

@@ -20,8 +20,6 @@ import createCompounder from './_createCompounder.js';
  * _.lowerCase('__FOO_BAR__');
  * // => 'foo bar'
  */
-var lowerCase = createCompounder(function(result, word, index) {
+var lowerCase = createCompounder((result, word, index) => result + (index ? ' ' : '') + word.toLowerCase());
-  return result + (index ? ' ' : '') + word.toLowerCase();
-});
 
 export default lowerCase;

lte.js

@@ -23,8 +23,6 @@ import createRelationalOperation from './_createRelationalOperation.js';
  * _.lte(3, 1);
  * // => false
  */
-var lte = createRelationalOperation(function(value, other) {
+var lte = createRelationalOperation((value, other) => value <= other);
-  return value <= other;
-});
 
 export default lte;

mapKeys.js

@@ -27,7 +27,7 @@ function mapKeys(object, iteratee) {
   var result = {};
   iteratee = baseIteratee(iteratee, 3);
 
-  baseForOwn(object, function(value, key, object) {
+  baseForOwn(object, (value, key, object) => {
     baseAssignValue(result, iteratee(value, key, object), value);
   });
   return result;

mapValues.js

@@ -34,7 +34,7 @@ function mapValues(object, iteratee) {
   var result = {};
   iteratee = baseIteratee(iteratee, 3);
 
-  baseForOwn(object, function(value, key, object) {
+  baseForOwn(object, (value, key, object) => {
     baseAssignValue(result, key, iteratee(value, key, object));
   });
   return result;

merge.js

@@ -32,7 +32,7 @@ import createAssigner from './_createAssigner.js';
  * _.merge(object, other);
  * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
  */
-var merge = createAssigner(function(object, source, srcIndex) {
+var merge = createAssigner((object, source, srcIndex) => {
   baseMerge(object, source, srcIndex);
 });
 

mergeWith.js

@@ -32,7 +32,7 @@ import createAssigner from './_createAssigner.js';
  * _.mergeWith(object, other, customizer);
  * // => { 'a': [1, 3], 'b': [2, 4] }
  */
-var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
+var mergeWith = createAssigner((object, source, srcIndex, customizer) => {
   baseMerge(object, source, srcIndex, customizer);
 });
 

method.js

@@ -25,10 +25,6 @@ import baseRest from './_baseRest.js';
  * _.map(objects, _.method(['a', 'b']));
  * // => [2, 1]
  */
-var method = baseRest(function(path, args) {
+var method = baseRest((path, args) => object => baseInvoke(object, path, args));
-  return function(object) {
-    return baseInvoke(object, path, args);
-  };
-});
 
 export default method;

methodOf.js

@@ -24,10 +24,6 @@ import baseRest from './_baseRest.js';
  * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
  * // => [2, 0]
  */
-var methodOf = baseRest(function(object, args) {
+var methodOf = baseRest((object, args) => path => baseInvoke(object, path, args));
-  return function(path) {
-    return baseInvoke(object, path, args);
-  };
-});
 
 export default methodOf;

multiply.js

@@ -15,8 +15,6 @@ import createMathOperation from './_createMathOperation.js';
  * _.multiply(6, 4);
  * // => 24
  */
-var multiply = createMathOperation(function(multiplier, multiplicand) {
+var multiply = createMathOperation((multiplier, multiplicand) => multiplier * multiplicand, 1);
-  return multiplier * multiplicand;
-}, 1);
 
 export default multiply;

now.js

@@ -16,8 +16,6 @@ import root from './_root.js';
  * }, _.now());
  * // => Logs the number of milliseconds it took for the deferred invocation.
  */
-var now = function() {
+var now = () => root.Date.now();
-  return root.Date.now();
-};
 
 export default now;

nthArg.js

@@ -24,9 +24,7 @@ import toInteger from './toInteger.js';
  */
 function nthArg(n) {
   n = toInteger(n);
-  return baseRest(function(args) {
+  return baseRest(args => baseNth(args, n));
-    return baseNth(args, n);
-  });
 }
 
 export default nthArg;

overArgs.js

@@ -41,7 +41,7 @@ var nativeMin = Math.min;
  * func(10, 5);
  * // => [100, 10]
  */
-var overArgs = castRest(function(func, transforms) {
+var overArgs = castRest((func, transforms) => {
   transforms = (transforms.length == 1 && isArray(transforms[0]))
     ? arrayMap(transforms[0], baseUnary(baseIteratee))
     : arrayMap(baseFlatten(transforms, 1), baseUnary(baseIteratee));

pick.js

@@ -18,8 +18,6 @@ import flatRest from './_flatRest.js';
  * _.pick(object, ['a', 'c']);
  * // => { 'a': 1, 'c': 3 }
  */
-var pick = flatRest(function(object, paths) {
+var pick = flatRest((object, paths) => object == null ? {} : basePick(object, paths));
-  return object == null ? {} : basePick(object, paths);
-});
 
 export default pick;

pickBy.js

@@ -25,13 +25,9 @@ function pickBy(object, predicate) {
   if (object == null) {
     return {};
   }
-  var props = arrayMap(getAllKeysIn(object), function(prop) {
+  var props = arrayMap(getAllKeysIn(object), prop => [prop]);
-    return [prop];
-  });
   predicate = baseIteratee(predicate);
-  return basePickBy(object, props, function(value, path) {
+  return basePickBy(object, props, (value, path) => predicate(value, path[0]));
-    return predicate(value, path[0]);
-  });
 }
 
 export default pickBy;

propertyOf.js

@@ -22,9 +22,7 @@ import baseGet from './_baseGet.js';
  * // => [2, 0]
  */
 function propertyOf(object) {
-  return function(path) {
+  return path => object == null ? undefined : baseGet(object, path);
-    return object == null ? undefined : baseGet(object, path);
-  };
 }
 
 export default propertyOf;

pullAt.js

@@ -29,13 +29,11 @@ import isIndex from './_isIndex.js';
  * console.log(pulled);
  * // => ['b', 'd']
  */
-var pullAt = flatRest(function(array, indexes) {
+var pullAt = flatRest((array, indexes) => {
   var length = array == null ? 0 : array.length,
       result = baseAt(array, indexes);
 
-  basePullAt(array, arrayMap(indexes, function(index) {
+  basePullAt(array, arrayMap(indexes, index => isIndex(index, length) ? +index : index).sort(compareAscending));
-    return isIndex(index, length) ? +index : index;
-  }).sort(compareAscending));
 
   return result;
 });

rearg.js

@@ -26,8 +26,6 @@ var WRAP_REARG_FLAG = 256;
  * rearged('b', 'c', 'a')
  * // => ['a', 'b', 'c']
  */
-var rearg = flatRest(function(func, indexes) {
+var rearg = flatRest((func, indexes) => createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes));
-  return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
-});
 
 export default rearg;

snakeCase.js

@@ -21,8 +21,8 @@ import createCompounder from './_createCompounder.js';
  * _.snakeCase('--FOO-BAR--');
  * // => 'foo_bar'
  */
-var snakeCase = createCompounder(function(result, word, index) {
+const snakeCase = createCompounder((result, word, index) =>
-  return result + (index ? '_' : '') + word.toLowerCase();
+  result + (index ? '_' : '') + word.toLowerCase()
-});
+);
 
 export default snakeCase;

startCase.js

@@ -22,8 +22,6 @@ import upperFirst from './upperFirst.js';
  * _.startCase('__FOO_BAR__');
  * // => 'FOO BAR'
  */
-var startCase = createCompounder(function(result, word, index) {
+var startCase = createCompounder((result, word, index) => result + (index ? ' ' : '') + upperFirst(word));
-  return result + (index ? ' ' : '') + upperFirst(word);
-});
 
 export default startCase;