Bump to v4.0.1.

internal/Symbol.js

@@ -1,6 +1,6 @@
 import root from './root';
 
 /** Built-in value references. */
-var _Symbol = root.Symbol;
+var Symbol = root.Symbol;
 
-export default _Symbol;
+export default Symbol;

internal/arrayReduce.js

@@ -6,14 +6,14 @@
  * @param {Array} array The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
- * @param {boolean} [initFromArray] Specify using the first element of `array` as the initial value.
+ * @param {boolean} [initAccum] Specify using the first element of `array` as the initial value.
  * @returns {*} Returns the accumulated value.
  */
-function arrayReduce(array, iteratee, accumulator, initFromArray) {
+function arrayReduce(array, iteratee, accumulator, initAccum) {
   var index = -1,
       length = array.length;
 
-  if (initFromArray && length) {
+  if (initAccum && length) {
     accumulator = array[++index];
   }
   while (++index < length) {

internal/arrayReduceRight.js

@@ -6,12 +6,12 @@
  * @param {Array} array The array to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} [accumulator] The initial value.
- * @param {boolean} [initFromArray] Specify using the last element of `array` as the initial value.
+ * @param {boolean} [initAccum] Specify using the last element of `array` as the initial value.
  * @returns {*} Returns the accumulated value.
  */
-function arrayReduceRight(array, iteratee, accumulator, initFromArray) {
+function arrayReduceRight(array, iteratee, accumulator, initAccum) {
   var length = array.length;
-  if (initFromArray && length) {
+  if (initAccum && length) {
     accumulator = array[--length];
   }
   while (length--) {

internal/baseFind.js

@@ -1,7 +1,7 @@
 /**
  * The base implementation of methods like `_.find` and `_.findKey`, without
  * support for iteratee shorthands, which iterates over `collection` using
- * the provided `eachFunc`.
+ * `eachFunc`.
  *
  * @private
  * @param {Array|Object} collection The collection to search.

internal/baseInvoke.js

@@ -8,7 +8,6 @@ import parent from './parent';
  * The base implementation of `_.invoke` without support for individual
  * method arguments.
  *
- *
  * @private
  * @param {Object} object The object to query.
  * @param {Array|string} path The path of the method to invoke.

internal/baseIsMatch.js

@@ -47,7 +47,10 @@ function baseIsMatch(object, source, matchData, customizer) {
       var stack = new Stack,
           result = customizer ? customizer(objValue, srcValue, key, object, source, stack) : undefined;
 
-      if (!(result === undefined ? baseIsEqual(srcValue, objValue, customizer, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG, stack) : result)) {
+      if (!(result === undefined
+            ? baseIsEqual(srcValue, objValue, customizer, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG, stack)
+            : result
+          )) {
         return false;
       }
     }

internal/baseMerge.js

@@ -13,10 +13,11 @@ import keysIn from '../keysIn';
  * @private
  * @param {Object} object The destination object.
  * @param {Object} source The source object.
+ * @param {number} srcIndex The index of `source`.
  * @param {Function} [customizer] The function to customize merged values.
  * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
  */
-function baseMerge(object, source, customizer, stack) {
+function baseMerge(object, source, srcIndex, customizer, stack) {
   if (object === source) {
     return;
   }
@@ -28,7 +29,7 @@ function baseMerge(object, source, customizer, stack) {
     }
     if (isObject(srcValue)) {
       stack || (stack = new Stack);
-      baseMergeDeep(object, source, key, baseMerge, customizer, stack);
+      baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
     }
     else {
       var newValue = customizer ? customizer(object[key], srcValue, (key + ''), object, source, stack) : undefined;

internal/baseMergeDeep.js

@@ -19,11 +19,12 @@ import toPlainObject from '../toPlainObject';
  * @param {Object} object The destination object.
  * @param {Object} source The source object.
  * @param {string} key The key of the value to merge.
+ * @param {number} srcIndex The index of `source`.
  * @param {Function} mergeFunc The function to merge values.
  * @param {Function} [customizer] The function to customize assigned values.
  * @param {Object} [stack] Tracks traversed source values and their merged counterparts.
  */
-function baseMergeDeep(object, source, key, mergeFunc, customizer, stack) {
+function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
   var objValue = object[key],
       srcValue = source[key],
       stacked = stack.get(srcValue) || stack.get(objValue);
@@ -38,24 +39,36 @@ function baseMergeDeep(object, source, key, mergeFunc, customizer, stack) {
   if (isCommon) {
     newValue = srcValue;
     if (isArray(srcValue) || isTypedArray(srcValue)) {
-      newValue = isArray(objValue)
-        ? objValue
-        : ((isArrayLikeObject(objValue)) ? copyArray(objValue) : baseClone(srcValue));
+      if (isArray(objValue)) {
+        newValue = srcIndex ? copyArray(objValue) : objValue;
+      }
+      else if (isArrayLikeObject(objValue)) {
+        newValue = copyArray(objValue);
+      }
+      else {
+        newValue = baseClone(srcValue);
+      }
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
-      newValue = isArguments(objValue)
-        ? toPlainObject(objValue)
-        : (isObject(objValue) ? objValue : baseClone(srcValue));
+      if (isArguments(objValue)) {
+        newValue = toPlainObject(objValue);
+      }
+      else if (!isObject(objValue) || (srcIndex && isFunction(objValue))) {
+        newValue = baseClone(srcValue);
+      }
+      else {
+        newValue = srcIndex ? baseClone(objValue) : objValue;
+      }
     }
     else {
-      isCommon = isFunction(srcValue);
+      isCommon = false;
     }
   }
   stack.set(srcValue, newValue);
 
   if (isCommon) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
-    mergeFunc(newValue, srcValue, customizer, stack);
+    mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
   }
   assignMergeValue(object, key, newValue);
 }

internal/basePickBy.js

@@ -11,7 +11,7 @@ import baseForIn from './baseForIn';
 function basePickBy(object, predicate) {
   var result = {};
   baseForIn(object, function(value, key) {
-    if (predicate(value)) {
+    if (predicate(value, key)) {
       result[key] = value;
     }
   });

internal/baseReduce.js

@@ -1,20 +1,19 @@
 /**
  * The base implementation of `_.reduce` and `_.reduceRight`, without support
- * for iteratee shorthands, which iterates over `collection` using the provided
- * `eachFunc`.
+ * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
  *
  * @private
  * @param {Array|Object} collection The collection to iterate over.
  * @param {Function} iteratee The function invoked per iteration.
  * @param {*} accumulator The initial value.
- * @param {boolean} initFromCollection Specify using the first or last element of `collection` as the initial value.
+ * @param {boolean} initAccum Specify using the first or last element of `collection` as the initial value.
  * @param {Function} eachFunc The function to iterate over `collection`.
  * @returns {*} Returns the accumulated value.
  */
-function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) {
+function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
   eachFunc(collection, function(value, index, collection) {
-    accumulator = initFromCollection
-      ? (initFromCollection = false, value)
+    accumulator = initAccum
+      ? (initAccum = false, value)
       : iteratee(accumulator, value, index, collection);
   });
   return accumulator;

internal/cloneSymbol.js

@@ -1,8 +1,8 @@
-import _Symbol from './_Symbol';
+import Symbol from './Symbol';
 
 /** Used to convert symbols to primitives and strings. */
-var symbolProto = _Symbol ? _Symbol.prototype : undefined,
-    symbolValueOf = _Symbol ? symbolProto.valueOf : undefined;
+var symbolProto = Symbol ? Symbol.prototype : undefined,
+    symbolValueOf = Symbol ? symbolProto.valueOf : undefined;
 
 /**
  * Creates a clone of the `symbol` object.
@@ -12,7 +12,7 @@ var symbolProto = _Symbol ? _Symbol.prototype : undefined,
  * @returns {Object} Returns the cloned symbol object.
  */
 function cloneSymbol(symbol) {
-  return _Symbol ? Object(symbolValueOf.call(symbol)) : {};
+  return Symbol ? Object(symbolValueOf.call(symbol)) : {};
 }
 
 export default cloneSymbol;

internal/createAssigner.js

@@ -24,7 +24,7 @@ function createAssigner(assigner) {
     while (++index < length) {
       var source = sources[index];
       if (source) {
-        assigner(object, source, customizer);
+        assigner(object, source, index, customizer);
       }
     }
     return object;

internal/createCaseFirst.js

@@ -3,14 +3,15 @@ import toString from '../toString';
 
 /** Used to compose unicode character classes. */
 var rsAstralRange = '\\ud800-\\udfff',
-    rsComboRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboSymbolsRange = '\\u20d0-\\u20f0',
     rsVarRange = '\\ufe0e\\ufe0f';
 
 /** Used to compose unicode capture groups. */
 var rsZWJ = '\\u200d';
 
 /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
+var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
 
 /**
  * Creates a function like `_.lowerFirst`.

internal/createPadding.js

@@ -5,14 +5,15 @@ import toInteger from '../toInteger';
 
 /** Used to compose unicode character classes. */
 var rsAstralRange = '\\ud800-\\udfff',
-    rsComboRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboSymbolsRange = '\\u20d0-\\u20f0',
     rsVarRange = '\\ufe0e\\ufe0f';
 
 /** Used to compose unicode capture groups. */
 var rsZWJ = '\\u200d';
 
 /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
+var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
 
 /* Built-in method references for those with the same name as other `lodash` methods. */
 var nativeCeil = Math.ceil;

internal/equalByTag.js

@@ -1,5 +1,5 @@
+import Symbol from './Symbol';
 import Uint8Array from './Uint8Array';
-import _Symbol from './_Symbol';
 import mapToArray from './mapToArray';
 import setToArray from './setToArray';
 
@@ -21,8 +21,8 @@ var boolTag = '[object Boolean]',
 var arrayBufferTag = '[object ArrayBuffer]';
 
 /** Used to convert symbols to primitives and strings. */
-var symbolProto = _Symbol ? _Symbol.prototype : undefined,
-    symbolValueOf = _Symbol ? symbolProto.valueOf : undefined;
+var symbolProto = Symbol ? Symbol.prototype : undefined,
+    symbolValueOf = Symbol ? symbolProto.valueOf : undefined;
 
 /**
  * A specialized version of `baseIsEqualDeep` for comparing objects of
@@ -80,7 +80,7 @@ function equalByTag(object, other, tag, equalFunc, customizer, bitmask) {
         equalFunc(convert(object), convert(other), customizer, bitmask | UNORDERED_COMPARE_FLAG);
 
     case symbolTag:
-      return !!_Symbol && (symbolValueOf.call(object) == symbolValueOf.call(other));
+      return !!Symbol && (symbolValueOf.call(object) == symbolValueOf.call(other));
   }
   return false;
 }

internal/equalObjects.js

@@ -2,8 +2,7 @@ import baseHas from './baseHas';
 import keys from '../keys';
 
 /** Used to compose bitmasks for comparison styles. */
-var UNORDERED_COMPARE_FLAG = 1,
-    PARTIAL_COMPARE_FLAG = 2;
+var PARTIAL_COMPARE_FLAG = 2;
 
 /**
  * A specialized version of `baseIsEqualDeep` for objects with support for
@@ -20,7 +19,6 @@ var UNORDERED_COMPARE_FLAG = 1,
  */
 function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
-      isUnordered = bitmask & UNORDERED_COMPARE_FLAG,
       objProps = keys(object),
       objLength = objProps.length,
       othProps = keys(other),
@@ -32,8 +30,7 @@ function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
   var index = objLength;
   while (index--) {
     var key = objProps[index];
-    if (!(isPartial ? key in other : baseHas(other, key)) ||
-        !(isUnordered || key == othProps[index])) {
+    if (!(isPartial ? key in other : baseHas(other, key))) {
       return false;
     }
   }

internal/getFuncName.js

@@ -1,5 +1,11 @@
 import realNames from './realNames';
 
+/** Used for built-in method references. */
+var objectProto = Object.prototype;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
 /**
  * Gets the name of `func`.
  *
@@ -10,7 +16,7 @@ import realNames from './realNames';
 function getFuncName(func) {
   var result = (func.name + ''),
       array = realNames[result],
-      length = array ? array.length : 0;
+      length = hasOwnProperty.call(realNames, result) ? array.length : 0;
 
   while (length--) {
     var data = array[length],

internal/mergeDefaults.js

@@ -1,4 +1,3 @@
-import baseClone from './baseClone';
 import baseMerge from './baseMerge';
 import isObject from '../isObject';
 
@@ -17,9 +16,9 @@ import isObject from '../isObject';
 function mergeDefaults(objValue, srcValue, key, object, source, stack) {
   if (isObject(objValue) && isObject(srcValue)) {
     stack.set(srcValue, objValue);
-    baseMerge(objValue, srcValue, mergeDefaults, stack);
+    baseMerge(objValue, srcValue, undefined, mergeDefaults, stack);
   }
-  return objValue === undefined ? baseClone(srcValue) : objValue;
+  return objValue;
 }
 
 export default mergeDefaults;

internal/stringSize.js

@@ -1,12 +1,14 @@
 /** Used to compose unicode character classes. */
 var rsAstralRange = '\\ud800-\\udfff',
-    rsComboRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboSymbolsRange = '\\u20d0-\\u20f0',
     rsVarRange = '\\ufe0e\\ufe0f';
 
 /** Used to compose unicode capture groups. */
 var rsAstral = '[' + rsAstralRange + ']',
-    rsCombo = '[' + rsComboRange + ']',
-    rsModifier = '(?:\\ud83c[\\udffb-\\udfff])',
+    rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
+    rsFitz = '\\ud83c[\\udffb-\\udfff]',
+    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
     rsNonAstral = '[^' + rsAstralRange + ']',
     rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
     rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
@@ -20,14 +22,15 @@ var reOptMod = rsModifier + '?',
     rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
 
 /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
-var reComplexSymbol = RegExp(rsSymbol + rsSeq, 'g');
+var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
 
 /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
-var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
+var reHasComplexSymbol = RegExp('[' + rsZWJ + rsAstralRange  + rsComboMarksRange + rsComboSymbolsRange + rsVarRange + ']');
 
 /**
  * Gets the number of symbols in `string`.
  *
+ * @private
  * @param {string} string The string to inspect.
  * @returns {number} Returns the string size.
  */

internal/stringToArray.js

@@ -1,12 +1,14 @@
 /** Used to compose unicode character classes. */
 var rsAstralRange = '\\ud800-\\udfff',
-    rsComboRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboMarksRange = '\\u0300-\\u036f\\ufe20-\\ufe23',
+    rsComboSymbolsRange = '\\u20d0-\\u20f0',
     rsVarRange = '\\ufe0e\\ufe0f';
 
 /** Used to compose unicode capture groups. */
 var rsAstral = '[' + rsAstralRange + ']',
-    rsCombo = '[' + rsComboRange + ']',
-    rsModifier = '(?:\\ud83c[\\udffb-\\udfff])',
+    rsCombo = '[' + rsComboMarksRange + rsComboSymbolsRange + ']',
+    rsFitz = '\\ud83c[\\udffb-\\udfff]',
+    rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
     rsNonAstral = '[^' + rsAstralRange + ']',
     rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
     rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
@@ -20,7 +22,7 @@ var reOptMod = rsModifier + '?',
     rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
 
 /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
-var reComplexSymbol = RegExp(rsSymbol + rsSeq, 'g');
+var reComplexSymbol = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
 
 /**
  * Converts `string` to an array.