Bump to v3.8.0.

internal/baseAssign.js

@@ -4,7 +4,7 @@ import isNative from '../lang/isNative';
 import keys from '../object/keys';
 
 /** Native method references. */
-var preventExtensions = isNative(Object.preventExtensions = Object.preventExtensions) && preventExtensions;
+var preventExtensions = isNative(preventExtensions = Object.preventExtensions) && preventExtensions;
 
 /** Used as `baseAssign`. */
 var nativeAssign = (function() {
@@ -14,12 +14,19 @@ var nativeAssign = (function() {
   //
   // Use `Object.preventExtensions` on a plain object instead of simply using
   // `Object('x')` because Chrome and IE fail to throw an error when attempting
-  // to assign values to readonly indexes of strings in strict mode.
-  var object = { '1': 0 },
-      func = preventExtensions && isNative(func = Object.assign) && func;
-
-  try { func(preventExtensions(object), 'xo'); } catch(e) {}
-  return !object[1] && func;
+  // to assign values to readonly indexes of strings.
+  var func = preventExtensions && isNative(func = Object.assign) && func;
+  try {
+    if (func) {
+      var object = preventExtensions({ '1': 0 });
+      object[0] = 1;
+    }
+  } catch(e) {
+    // Only attempt in strict mode.
+    try { func(object, 'xo'); } catch(e) {}
+    return !object[1] && func;
+  }
+  return false;
 }());
 
 /**

internal/baseAt.js

@@ -1,5 +1,5 @@
+import isArrayLike from './isArrayLike';
 import isIndex from './isIndex';
-import isLength from './isLength';
 
 /**
  * The base implementation of `_.at` without support for string collections
@@ -12,8 +12,9 @@ import isLength from './isLength';
  */
 function baseAt(collection, props) {
   var index = -1,
-      length = collection.length,
-      isArr = isLength(length),
+      isNil = collection == null,
+      isArr = !isNil && isArrayLike(collection),
+      length = isArr && collection.length,
       propsLength = props.length,
       result = Array(propsLength);
 
@@ -22,7 +23,7 @@ function baseAt(collection, props) {
     if (isArr) {
       result[index] = isIndex(key, length) ? collection[key] : undefined;
     } else {
-      result[index] = collection[key];
+      result[index] = isNil ? undefined : collection[key];
     }
   }
   return result;

internal/baseFlatten.js

@@ -1,6 +1,6 @@
 import isArguments from '../lang/isArguments';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObjectLike from './isObjectLike';
 
 /**
@@ -9,8 +9,8 @@ import isObjectLike from './isObjectLike';
  *
  * @private
  * @param {Array} array The array to flatten.
- * @param {boolean} isDeep Specify a deep flatten.
- * @param {boolean} isStrict Restrict flattening to arrays and `arguments` objects.
+ * @param {boolean} [isDeep] Specify a deep flatten.
+ * @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
  * @returns {Array} Returns the new flattened array.
  */
 function baseFlatten(array, isDeep, isStrict) {
@@ -21,8 +21,8 @@ function baseFlatten(array, isDeep, isStrict) {
 
   while (++index < length) {
     var value = array[index];
-
-    if (isObjectLike(value) && isLength(value.length) && (isArray(value) || isArguments(value))) {
+    if (isObjectLike(value) && isArrayLike(value) &&
+        (isStrict || isArray(value) || isArguments(value))) {
       if (isDeep) {
         // Recursively flatten arrays (susceptible to call stack limits).
         value = baseFlatten(value, isDeep, isStrict);
@@ -30,7 +30,6 @@ function baseFlatten(array, isDeep, isStrict) {
       var valIndex = -1,
           valLength = value.length;
 
-      result.length += valLength;
       while (++valIndex < valLength) {
         result[++resIndex] = value[valIndex];
       }

internal/baseGet.js

@@ -21,9 +21,9 @@ function baseGet(object, path, pathKey) {
       length = path.length;
 
   while (object != null && ++index < length) {
-    var result = object = object[path[index]];
+    object = object[path[index]];
   }
-  return result;
+  return (index && index == length) ? object : undefined;
 }
 
 export default baseGet;

internal/baseIsEqual.js

@@ -16,8 +16,7 @@ import baseIsEqualDeep from './baseIsEqualDeep';
 function baseIsEqual(value, other, customizer, isLoose, stackA, stackB) {
   // Exit early for identical values.
   if (value === other) {
-    // Treat `+0` vs. `-0` as not equal.
-    return value !== 0 || (1 / value == 1 / other);
+    return true;
   }
   var valType = typeof value,
       othType = typeof other;

internal/baseMap.js

@@ -1,6 +1,5 @@
 import baseEach from './baseEach';
-import getLength from './getLength';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 
 /**
  * The base implementation of `_.map` without support for callback shorthands
@@ -13,8 +12,7 @@ import isLength from './isLength';
  */
 function baseMap(collection, iteratee) {
   var index = -1,
-      length = getLength(collection),
-      result = isLength(length) ? Array(length) : [];
+      result = isArrayLike(collection) ? Array(collection.length) : [];
 
   baseEach(collection, function(value, key, collection) {
     result[++index] = iteratee(value, key, collection);

internal/baseMerge.js

@@ -2,7 +2,7 @@ import arrayEach from './arrayEach';
 import baseMergeDeep from './baseMergeDeep';
 import getSymbols from './getSymbols';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObject from '../lang/isObject';
 import isObjectLike from './isObjectLike';
 import isTypedArray from '../lang/isTypedArray';
@@ -30,7 +30,7 @@ function baseMerge(object, source, customizer, stackA, stackB) {
   if (!isObject(object)) {
     return object;
   }
-  var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source));
+  var isSrcArr = isArrayLike(source) && (isArray(source) || isTypedArray(source));
   if (!isSrcArr) {
     var props = keys(source);
     push.apply(props, getSymbols(source));

internal/baseMergeDeep.js

@@ -1,8 +1,7 @@
 import arrayCopy from './arrayCopy';
-import getLength from './getLength';
 import isArguments from '../lang/isArguments';
 import isArray from '../lang/isArray';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isPlainObject from '../lang/isPlainObject';
 import isTypedArray from '../lang/isTypedArray';
 import toPlainObject from '../lang/toPlainObject';
@@ -38,10 +37,10 @@ function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stack
 
   if (isCommon) {
     result = srcValue;
-    if (isLength(srcValue.length) && (isArray(srcValue) || isTypedArray(srcValue))) {
+    if (isArrayLike(srcValue) && (isArray(srcValue) || isTypedArray(srcValue))) {
       result = isArray(value)
         ? value
-        : (getLength(value) ? arrayCopy(value) : []);
+        : (isArrayLike(value) ? arrayCopy(value) : []);
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
       result = isArguments(value)

internal/basePullAt.js

@@ -16,7 +16,7 @@ var splice = arrayProto.splice;
  * @returns {Array} Returns `array`.
  */
 function basePullAt(array, indexes) {
-  var length = indexes.length;
+  var length = array ? indexes.length : 0;
   while (length--) {
     var index = parseFloat(indexes[length]);
     if (index != previous && isIndex(index)) {

internal/binaryIndexBy.js

@@ -6,7 +6,7 @@ var nativeMin = Math.min;
 
 /** Used as references for the maximum length and index of an array. */
 var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1,
-    MAX_ARRAY_INDEX =  MAX_ARRAY_LENGTH - 1;
+    MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;
 
 /**
  * This function is like `binaryIndex` except that it invokes `iteratee` for

internal/composeArgsRight.js

@@ -23,12 +23,12 @@ function composeArgsRight(args, partials, holders) {
   while (++argsIndex < argsLength) {
     result[argsIndex] = args[argsIndex];
   }
-  var pad = argsIndex;
+  var offset = argsIndex;
   while (++rightIndex < rightLength) {
-    result[pad + rightIndex] = partials[rightIndex];
+    result[offset + rightIndex] = partials[rightIndex];
   }
   while (++holdersIndex < holdersLength) {
-    result[pad + holders[holdersIndex]] = args[argsIndex++];
+    result[offset + holders[holdersIndex]] = args[argsIndex++];
   }
   return result;
 }

internal/createFind.js

@@ -19,7 +19,7 @@ function createFind(eachFunc, fromRight) {
       return index > -1 ? collection[index] : undefined;
     }
     return baseFind(collection, predicate, eachFunc);
-  }
+  };
 }
 
 export default createFind;

internal/createFlow.js

@@ -4,6 +4,12 @@ import getFuncName from './getFuncName';
 import isArray from '../lang/isArray';
 import isLaziable from './isLaziable';
 
+/** Used to compose bitmasks for wrapper metadata. */
+var CURRY_FLAG = 8,
+    PARTIAL_FLAG = 32,
+    ARY_FLAG = 128,
+    REARG_FLAG = 256;
+
 /** Used as the `TypeError` message for "Functions" methods. */
 var FUNC_ERROR_TEXT = 'Expected a function';
 
@@ -39,7 +45,7 @@ function createFlow(fromRight) {
       funcName = getFuncName(func);
 
       var data = funcName == 'wrapper' ? getData(func) : null;
-      if (data && isLaziable(data[0])) {
+      if (data && isLaziable(data[0]) && data[1] == (ARY_FLAG | CURRY_FLAG | PARTIAL_FLAG | REARG_FLAG) && !data[4].length && data[9] == 1) {
         wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
       } else {
         wrapper = (func.length == 1 && isLaziable(func)) ? wrapper[funcName]() : wrapper.thru(func);

internal/createObjectMapper.js

@@ -0,0 +1,26 @@
+import baseCallback from './baseCallback';
+import baseForOwn from './baseForOwn';
+
+/**
+ * Creates a function for `_.mapKeys` or `_.mapValues`.
+ *
+ * @private
+ * @param {boolean} [isMapKeys] Specify mapping keys instead of values.
+ * @returns {Function} Returns the new map function.
+ */
+function createObjectMapper(isMapKeys) {
+  return function(object, iteratee, thisArg) {
+    var result = {};
+    iteratee = baseCallback(iteratee, thisArg, 3);
+
+    baseForOwn(object, function(value, key, object) {
+      var mapped = iteratee(value, key, object);
+      key = isMapKeys ? mapped : key;
+      value = isMapKeys ? value : mapped;
+      result[key] = value;
+    });
+    return result;
+  };
+}
+
+export default createObjectMapper;

internal/createPadDir.js

@@ -11,7 +11,7 @@ import createPadding from './createPadding';
 function createPadDir(fromRight) {
   return function(string, length, chars) {
     string = baseToString(string);
-    return string && ((fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string));
+    return (fromRight ? string : '') + createPadding(string, length, chars) + (fromRight ? '' : string);
   };
 }
 

internal/equalByTag.js

@@ -34,8 +34,7 @@ function equalByTag(object, other, tag) {
       // Treat `NaN` vs. `NaN` as equal.
       return (object != +object)
         ? other != +other
-        // But, treat `-0` vs. `+0` as not equal.
-        : (object == 0 ? ((1 / object) == (1 / other)) : object == +other);
+        : object == +other;
 
     case regexpTag:
     case stringTag:

internal/getLength.js

@@ -4,7 +4,7 @@ import baseProperty from './baseProperty';
  * Gets the "length" property value of `object`.
  *
  * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
- * in Safari on iOS 8.1 ARM64.
+ * that affects Safari on at least iOS 8.1-8.3 ARM64.
  *
  * @private
  * @param {Object} object The object to query.

internal/isArrayLike.js

@@ -0,0 +1,15 @@
+import getLength from './getLength';
+import isLength from './isLength';
+
+/**
+ * Checks if `value` is array-like.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+ */
+function isArrayLike(value) {
+  return value != null && isLength(getLength(value));
+}
+
+export default isArrayLike;

internal/isIterateeCall.js

@@ -1,6 +1,5 @@
-import getLength from './getLength';
+import isArrayLike from './isArrayLike';
 import isIndex from './isIndex';
-import isLength from './isLength';
 import isObject from '../lang/isObject';
 
 /**
@@ -17,13 +16,9 @@ function isIterateeCall(value, index, object) {
     return false;
   }
   var type = typeof index;
-  if (type == 'number') {
-    var length = getLength(object),
-        prereq = isLength(length) && isIndex(index, length);
-  } else {
-    prereq = type == 'string' && index in object;
-  }
-  if (prereq) {
+  if (type == 'number'
+      ? (isArrayLike(object) && isIndex(index, object.length))
+      : (type == 'string' && index in object)) {
     var other = object[index];
     return value === value ? (value === other) : (other !== other);
   }

internal/isKey.js

@@ -2,7 +2,7 @@ import isArray from '../lang/isArray';
 import toObject from './toObject';
 
 /** Used to match property names within property paths. */
-var reIsDeepProp = /\.|\[(?:[^[\]]+|(["'])(?:(?!\1)[^\n\\]|\\.)*?)\1\]/,
+var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
     reIsPlainProp = /^\w*$/;
 
 /**

internal/isStrictComparable.js

@@ -9,7 +9,7 @@ import isObject from '../lang/isObject';
  *  equality comparisons, else `false`.
  */
 function isStrictComparable(value) {
-  return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value));
+  return value === value && !isObject(value);
 }
 
 export default isStrictComparable;

internal/pickByArray.js

@@ -1,7 +1,7 @@
 import toObject from './toObject';
 
 /**
- * A specialized version of `_.pick` that picks `object` properties specified
+ * A specialized version of `_.pick` which picks `object` properties specified
  * by `props`.
  *
  * @private

internal/pickByCallback.js

@@ -1,7 +1,7 @@
 import baseForIn from './baseForIn';
 
 /**
- * A specialized version of `_.pick` that picks `object` properties `predicate`
+ * A specialized version of `_.pick` which picks `object` properties `predicate`
  * returns truthy for.
  *
  * @private

internal/toIterable.js

@@ -1,5 +1,4 @@
-import getLength from './getLength';
-import isLength from './isLength';
+import isArrayLike from './isArrayLike';
 import isObject from '../lang/isObject';
 import values from '../object/values';
 
@@ -14,7 +13,7 @@ function toIterable(value) {
   if (value == null) {
     return [];
   }
-  if (!isLength(getLength(value))) {
+  if (!isArrayLike(value)) {
     return values(value);
   }
   return isObject(value) ? value : Object(value);