lodash.merge - npm Package Compare versions

Comparing version 3.3.2 to 4.0.0

index.js

 /**
- * lodash 3.3.2 (Custom Build) <https://lodash.com/>
- * Build: `lodash modern modularize exports="npm" -o ./`
- * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
+ * lodash 4.0.0 (Custom Build) <https://lodash.com/>
+ * Build: `lodash modularize exports="npm" -o ./`
+ * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
- * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  * Available under MIT license <https://lodash.com/license>
  */
-var arrayCopy = require('lodash._arraycopy'),
+var Stack = require('lodash._stack'),
     arrayEach = require('lodash._arrayeach'),
-    createAssigner = require('lodash._createassigner'),
-    isArguments = require('lodash.isarguments'),
-    isArray = require('lodash.isarray'),
+    baseFor = require('lodash._basefor'),
     isPlainObject = require('lodash.isplainobject'),
-    isTypedArray = require('lodash.istypedarray'),
     keys = require('lodash.keys'),
-    toPlainObject = require('lodash.toplainobject');
+    keysIn = require('lodash.keysin'),
+    rest = require('lodash.rest');
 
+/** Used as references for various `Number` constants. */
+var MAX_SAFE_INTEGER = 9007199254740991;
+
+/** `Object#toString` result references. */
+var argsTag = '[object Arguments]',
+    arrayTag = '[object Array]',
+    boolTag = '[object Boolean]',
+    dateTag = '[object Date]',
+    errorTag = '[object Error]',
+    funcTag = '[object Function]',
+    genTag = '[object GeneratorFunction]',
+    mapTag = '[object Map]',
+    numberTag = '[object Number]',
+    objectTag = '[object Object]',
+    regexpTag = '[object RegExp]',
+    setTag = '[object Set]',
+    stringTag = '[object String]',
+    symbolTag = '[object Symbol]',
+    weakMapTag = '[object WeakMap]';
+
+var arrayBufferTag = '[object ArrayBuffer]',
+    float32Tag = '[object Float32Array]',
+    float64Tag = '[object Float64Array]',
+    int8Tag = '[object Int8Array]',
+    int16Tag = '[object Int16Array]',
+    int32Tag = '[object Int32Array]',
+    uint8Tag = '[object Uint8Array]',
+    uint8ClampedTag = '[object Uint8ClampedArray]',
+    uint16Tag = '[object Uint16Array]',
+    uint32Tag = '[object Uint32Array]';
+
+/** Used to match `RegExp` [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns). */
+var reRegExpChar = /[\\^$.*+?()[\]{}|]/g;
+
+/** Used to match `RegExp` flags from their coerced string values. */
+var reFlags = /\w*$/;
+
+/** Used to detect host constructors (Safari > 5). */
+var reIsHostCtor = /^\[object .+?Constructor\]$/;
+
+/** Used to detect unsigned integer values. */
+var reIsUint = /^(?:0|[1-9]\d*)$/;
+
+/** Used to identify `toStringTag` values of typed arrays. */
+var typedArrayTags = {};
+typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
+typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
+typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
+typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
+typedArrayTags[uint32Tag] = true;
+typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
+typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
+typedArrayTags[dateTag] = typedArrayTags[errorTag] =
+typedArrayTags[funcTag] = typedArrayTags[mapTag] =
+typedArrayTags[numberTag] = typedArrayTags[objectTag] =
+typedArrayTags[regexpTag] = typedArrayTags[setTag] =
+typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false;
+
+/** Used to identify `toStringTag` values supported by `_.clone`. */
+var cloneableTags = {};
+cloneableTags[argsTag] = cloneableTags[arrayTag] =
+cloneableTags[arrayBufferTag] = cloneableTags[boolTag] =
+cloneableTags[dateTag] = cloneableTags[float32Tag] =
+cloneableTags[float64Tag] = cloneableTags[int8Tag] =
+cloneableTags[int16Tag] = cloneableTags[int32Tag] =
+cloneableTags[mapTag] = cloneableTags[numberTag] =
+cloneableTags[objectTag] = cloneableTags[regexpTag] =
+cloneableTags[setTag] = cloneableTags[stringTag] =
+cloneableTags[symbolTag] = cloneableTags[uint8Tag] =
+cloneableTags[uint8ClampedTag] = cloneableTags[uint16Tag] =
+cloneableTags[uint32Tag] = true;
+cloneableTags[errorTag] = cloneableTags[funcTag] =
+cloneableTags[weakMapTag] = false;
+
 /**
- * Checks if `value` is object-like.
+ * Adds the key-value `pair` to `map`.
  *
  * @private
+ * @param {Object} map The map to modify.
+ * @param {Array} pair The key-value pair to add.
+ * @returns {Object} Returns `map`.
+ */
+function addMapEntry(map, pair) {
+  map.set(pair[0], pair[1]);
+  return map;
+}
+
+/**
+ * Adds `value` to `set`.
+ *
+ * @private
+ * @param {Object} set The set to modify.
+ * @param {*} value The value to add.
+ * @returns {Object} Returns `set`.
+ */
+function addSetEntry(set, value) {
+  set.add(value);
+  return set;
+}
+
+/**
+ * A specialized version of `_.reduce` for arrays without support for
+ * iteratee shorthands.
+ *
+ * @private
+ * @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.
+ * @returns {*} Returns the accumulated value.
+ */
+function arrayReduce(array, iteratee, accumulator, initFromArray) {
+  var index = -1,
+      length = array.length;
+
+  if (initFromArray && length) {
+    accumulator = array[++index];
+  }
+  while (++index < length) {
+    accumulator = iteratee(accumulator, array[index], index, array);
+  }
+  return accumulator;
+}
+
+/**
+ * Checks if `value` is a host object in IE < 9.
+ *
+ * @private
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+ * @returns {boolean} Returns `true` if `value` is a host object, else `false`.
  */
-function isObjectLike(value) {
-  return !!value && typeof value == 'object';
+function isHostObject(value) {
+  // Many host objects are `Object` objects that can coerce to strings
+  // despite having improperly defined `toString` methods.
+  var result = false;
+  if (value != null && typeof value.toString != 'function') {
+    try {
+      result = !!(value + '');
+    } catch (e) {}
+  }
+  return result;
 }
 
 /**
- * Used as the [maximum length](http://ecma-international.org/ecma-262/6.0/#sec-number.max_safe_integer)
- * of an array-like value.
+ * Checks if `value` is a valid array-like index.
+ *
+ * @private
+ * @param {*} value The value to check.
+ * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+ * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
  */
-var MAX_SAFE_INTEGER = 9007199254740991;
+function isIndex(value, length) {
+  value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
+  length = length == null ? MAX_SAFE_INTEGER : length;
+  return value > -1 && value % 1 == 0 && value < length;
+}
 
 /**
- * The base implementation of `_.merge` without support for argument juggling,
- * multiple sources, and `this` binding `customizer` functions.
+ * Converts `map` to an array.
  *
  * @private
+ * @param {Object} map The map to convert.
+ * @returns {Array} Returns the converted array.
+ */
+function mapToArray(map) {
+  var index = -1,
+      result = Array(map.size);
+
+  map.forEach(function(value, key) {
+    result[++index] = [key, value];
+  });
+  return result;
+}
+
+/**
+ * Converts `set` to an array.
+ *
+ * @private
+ * @param {Object} set The set to convert.
+ * @returns {Array} Returns the converted array.
+ */
+function setToArray(set) {
+  var index = -1,
+      result = Array(set.size);
+
+  set.forEach(function(value) {
+    result[++index] = value;
+  });
+  return result;
+}
+
+/** Used for built-in method references. */
+var objectProto = global.Object.prototype;
+
+/** Used to resolve the decompiled source of functions. */
+var funcToString = global.Function.prototype.toString;
+
+/** Used to check objects for own properties. */
+var hasOwnProperty = objectProto.hasOwnProperty;
+
+/**
+ * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/** Used to detect if a method is native. */
+var reIsNative = RegExp('^' +
+  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
+  .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
+);
+
+/** Built-in value references. */
+var _Symbol = global.Symbol,
+    Uint8Array = global.Uint8Array,
+    getOwnPropertySymbols = Object.getOwnPropertySymbols,
+    propertyIsEnumerable = objectProto.propertyIsEnumerable;
+
+/* Built-in method references that are verified to be native. */
+var Map = getNative(global, 'Map'),
+    Set = getNative(global, 'Set');
+
+/** Used to detect maps and sets. */
+var mapCtorString = Map ? funcToString.call(Map) : '',
+    setCtorString = Set ? funcToString.call(Set) : '';
+
+/** Used to convert symbols to primitives and strings. */
+var symbolProto = _Symbol ? _Symbol.prototype : undefined,
+    symbolValueOf = _Symbol ? symbolProto.valueOf : undefined;
+
+/**
+ * This function is like `assignValue` except that it doesn't assign `undefined` values.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignMergeValue(object, key, value) {
+  if ((value !== undefined && !eq(object[key], value)) ||
+      (typeof key == 'number' && value === undefined && !(key in object))) {
+    object[key] = value;
+  }
+}
+
+/**
+ * Assigns `value` to `key` of `object` if the existing value is not equivalent
+ * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * for equality comparisons.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {string} key The key of the property to assign.
+ * @param {*} value The value to assign.
+ */
+function assignValue(object, key, value) {
+  var objValue = object[key];
+  if ((!eq(objValue, value) ||
+        (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) ||
+      (value === undefined && !(key in object))) {
+    object[key] = value;
+  }
+}
+
+/**
+ * The base implementation of `_.assign` without support for multiple sources
+ * or `customizer` functions.
+ *
+ * @private
  * @param {Object} object The destination object.
  * @param {Object} source The source object.
- * @param {Function} [customizer] The function to customize merged values.
- * @param {Array} [stackA=[]] Tracks traversed source objects.
- * @param {Array} [stackB=[]] Associates values with source counterparts.
  * @returns {Object} Returns `object`.
  */
-function baseMerge(object, source, customizer, stackA, stackB) {
-  if (!isObject(object)) {
-    return object;
+function baseAssign(object, source) {
+  return object && copyObject(source, keys(source), object);
+}
+
+/**
+ * The base implementation of `_.clone` and `_.cloneDeep` which tracks
+ * traversed objects.
+ *
+ * @private
+ * @param {*} value The value to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @param {Function} [customizer] The function to customize cloning.
+ * @param {string} [key] The key of `value`.
+ * @param {Object} [object] The parent object of `value`.
+ * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
+ * @returns {*} Returns the cloned value.
+ */
+function baseClone(value, isDeep, customizer, key, object, stack) {
+  var result;
+  if (customizer) {
+    result = object ? customizer(value, key, object, stack) : customizer(value);
   }
-  var isSrcArr = isArrayLike(source) && (isArray(source) || isTypedArray(source)),
-      props = isSrcArr ? undefined : keys(source);
+  if (result !== undefined) {
+    return result;
+  }
+  if (!isObject(value)) {
+    return value;
+  }
+  var isArr = isArray(value);
+  if (isArr) {
+    result = initCloneArray(value);
+    if (!isDeep) {
+      return copyArray(value, result);
+    }
+  } else {
+    var tag = getTag(value),
+        isFunc = tag == funcTag || tag == genTag;
 
+    if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
+      if (isHostObject(value)) {
+        return object ? value : {};
+      }
+      result = initCloneObject(isFunc ? {} : value);
+      if (!isDeep) {
+        return copySymbols(value, baseAssign(result, value));
+      }
+    } else {
+      return cloneableTags[tag]
+        ? initCloneByTag(value, tag, isDeep)
+        : (object ? value : {});
+    }
+  }
+  // Check for circular references and return its corresponding clone.
+  stack || (stack = new Stack);
+  var stacked = stack.get(value);
+  if (stacked) {
+    return stacked;
+  }
+  stack.set(value, result);
+
+  // Recursively populate clone (susceptible to call stack limits).
+  (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) {
+    assignValue(result, key, baseClone(subValue, isDeep, customizer, key, value, stack));
+  });
+  return isArr ? result : copySymbols(value, result);
+}
+
+/**
+ * The base implementation of `_.create` without support for assigning
+ * properties to the created object.
+ *
+ * @private
+ * @param {Object} prototype The object to inherit from.
+ * @returns {Object} Returns the new object.
+ */
+var baseCreate = (function() {
+  function object() {}
+  return function(prototype) {
+    if (isObject(prototype)) {
+      object.prototype = prototype;
+      var result = new object;
+      object.prototype = undefined;
+    }
+    return result || {};
+  };
+}());
+
+/**
+ * The base implementation of `_.forOwn` without support for iteratee shorthands.
+ *
+ * @private
+ * @param {Object} object The object to iterate over.
+ * @param {Function} iteratee The function invoked per iteration.
+ * @returns {Object} Returns `object`.
+ */
+function baseForOwn(object, iteratee) {
+  return object && baseFor(object, iteratee, keys);
+}
+
+/**
+ * The base implementation of `_.merge` without support for multiple sources.
+ *
+ * @private
+ * @param {Object} object The destination object.
+ * @param {Object} source The source object.
+ * @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) {
+  if (object === source) {
+    return;
+  }
+  var props = (isArray(source) || isTypedArray(source)) ? undefined : keysIn(source);
   arrayEach(props || source, function(srcValue, key) {
@@ -60,22 +408,14 @@ if (props) {
     }
-    if (isObjectLike(srcValue)) {
-      stackA || (stackA = []);
-      stackB || (stackB = []);
-      baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
+    if (isObject(srcValue)) {
+      stack || (stack = new Stack);
+      baseMergeDeep(object, source, key, baseMerge, customizer, stack);
     }
     else {
-      var value = object[key],
-          result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
-          isCommon = result === undefined;
-
-      if (isCommon) {
-        result = srcValue;
+      var newValue = customizer ? customizer(object[key], srcValue, (key + ''), object, source, stack) : undefined;
+      if (newValue === undefined) {
+        newValue = srcValue;
       }
-      if ((result !== undefined || (isSrcArr && !(key in object))) &&
-          (isCommon || (result === result ? (result !== value) : (value === value)))) {
-        object[key] = result;
-      }
+      assignMergeValue(object, key, newValue);
     }
   });
-  return object;
 }
@@ -93,48 +433,40 @@
  * @param {Function} mergeFunc The function to merge values.
- * @param {Function} [customizer] The function to customize merged values.
- * @param {Array} [stackA=[]] Tracks traversed source objects.
- * @param {Array} [stackB=[]] Associates values with source counterparts.
- * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
+ * @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, stackA, stackB) {
-  var length = stackA.length,
-      srcValue = source[key];
+function baseMergeDeep(object, source, key, mergeFunc, customizer, stack) {
+  var objValue = object[key],
+      srcValue = source[key],
+      stacked = stack.get(srcValue) || stack.get(objValue);
 
-  while (length--) {
-    if (stackA[length] == srcValue) {
-      object[key] = stackB[length];
-      return;
-    }
+  if (stacked) {
+    assignMergeValue(object, key, stacked);
+    return;
   }
-  var value = object[key],
-      result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
-      isCommon = result === undefined;
+  var newValue = customizer ? customizer(objValue, srcValue, (key + ''), object, source, stack) : undefined,
+      isCommon = newValue === undefined;
 
   if (isCommon) {
-    result = srcValue;
-    if (isArrayLike(srcValue) && (isArray(srcValue) || isTypedArray(srcValue))) {
-      result = isArray(value)
-        ? value
-        : (isArrayLike(value) ? arrayCopy(value) : []);
+    newValue = srcValue;
+    if (isArray(srcValue) || isTypedArray(srcValue)) {
+      newValue = isArray(objValue)
+        ? objValue
+        : ((isArrayLikeObject(objValue)) ? copyArray(objValue) : baseClone(srcValue));
     }
     else if (isPlainObject(srcValue) || isArguments(srcValue)) {
-      result = isArguments(value)
-        ? toPlainObject(value)
-        : (isPlainObject(value) ? value : {});
+      newValue = isArguments(objValue)
+        ? toPlainObject(objValue)
+        : (isObject(objValue) ? objValue : baseClone(srcValue));
     }
     else {
-      isCommon = false;
+      isCommon = isFunction(srcValue);
     }
   }
-  // Add the source value to the stack of traversed objects and associate
-  // it with its merged value.
-  stackA.push(srcValue);
-  stackB.push(result);
+  stack.set(srcValue, newValue);
 
   if (isCommon) {
     // Recursively merge objects and arrays (susceptible to call stack limits).
-    object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB);
-  } else if (result === result ? (result !== value) : (value === value)) {
-    object[key] = result;
+    mergeFunc(newValue, srcValue, customizer, stack);
   }
+  assignMergeValue(object, key, newValue);
 }
@@ -156,2 +488,183 @@
 /**
+ * Creates a clone of `buffer`.
+ *
+ * @private
+ * @param {ArrayBuffer} buffer The array buffer to clone.
+ * @returns {ArrayBuffer} Returns the cloned array buffer.
+ */
+function cloneBuffer(buffer) {
+  var Ctor = buffer.constructor,
+      result = new Ctor(buffer.byteLength),
+      view = new Uint8Array(result);
+
+  view.set(new Uint8Array(buffer));
+  return result;
+}
+
+/**
+ * Creates a clone of `map`.
+ *
+ * @private
+ * @param {Object} map The map to clone.
+ * @returns {Object} Returns the cloned map.
+ */
+function cloneMap(map) {
+  var Ctor = map.constructor;
+  return arrayReduce(mapToArray(map), addMapEntry, new Ctor);
+}
+
+/**
+ * Creates a clone of `regexp`.
+ *
+ * @private
+ * @param {Object} regexp The regexp to clone.
+ * @returns {Object} Returns the cloned regexp.
+ */
+function cloneRegExp(regexp) {
+  var Ctor = regexp.constructor,
+      result = new Ctor(regexp.source, reFlags.exec(regexp));
+
+  result.lastIndex = regexp.lastIndex;
+  return result;
+}
+
+/**
+ * Creates a clone of `set`.
+ *
+ * @private
+ * @param {Object} set The set to clone.
+ * @returns {Object} Returns the cloned set.
+ */
+function cloneSet(set) {
+  var Ctor = set.constructor;
+  return arrayReduce(setToArray(set), addSetEntry, new Ctor);
+}
+
+/**
+ * Creates a clone of the `symbol` object.
+ *
+ * @private
+ * @param {Object} symbol The symbol object to clone.
+ * @returns {Object} Returns the cloned symbol object.
+ */
+function cloneSymbol(symbol) {
+  return _Symbol ? Object(symbolValueOf.call(symbol)) : {};
+}
+
+/**
+ * Creates a clone of `typedArray`.
+ *
+ * @private
+ * @param {Object} typedArray The typed array to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the cloned typed array.
+ */
+function cloneTypedArray(typedArray, isDeep) {
+  var buffer = typedArray.buffer,
+      Ctor = typedArray.constructor;
+
+  return new Ctor(isDeep ? cloneBuffer(buffer) : buffer, typedArray.byteOffset, typedArray.length);
+}
+
+/**
+ * Copies the values of `source` to `array`.
+ *
+ * @private
+ * @param {Array} source The array to copy values from.
+ * @param {Array} [array=[]] The array to copy values to.
+ * @returns {Array} Returns `array`.
+ */
+function copyArray(source, array) {
+  var index = -1,
+      length = source.length;
+
+  array || (array = Array(length));
+  while (++index < length) {
+    array[index] = source[index];
+  }
+  return array;
+}
+
+/**
+ * Copies properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property names to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @returns {Object} Returns `object`.
+ */
+function copyObject(source, props, object) {
+  return copyObjectWith(source, props, object);
+}
+
+/**
+ * This function is like `copyObject` except that it accepts a function to
+ * customize copied values.
+ *
+ * @private
+ * @param {Object} source The object to copy properties from.
+ * @param {Array} props The property names to copy.
+ * @param {Object} [object={}] The object to copy properties to.
+ * @param {Function} [customizer] The function to customize copied values.
+ * @returns {Object} Returns `object`.
+ */
+function copyObjectWith(source, props, object, customizer) {
+  object || (object = {});
+
+  var index = -1,
+      length = props.length;
+
+  while (++index < length) {
+    var key = props[index],
+        newValue = customizer ? customizer(object[key], source[key], key, object, source) : source[key];
+
+    assignValue(object, key, newValue);
+  }
+  return object;
+}
+
+/**
+ * Copies own symbol properties of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns `object`.
+ */
+function copySymbols(source, object) {
+  return copyObject(source, getSymbols(source), object);
+}
+
+/**
+ * Creates a function like `_.assign`.
+ *
+ * @private
+ * @param {Function} assigner The function to assign values.
+ * @returns {Function} Returns the new assigner function.
+ */
+function createAssigner(assigner) {
+  return rest(function(object, sources) {
+    var index = -1,
+        length = sources.length,
+        customizer = length > 1 ? sources[length - 1] : undefined,
+        guard = length > 2 ? sources[2] : undefined;
+
+    customizer = typeof customizer == 'function' ? (length--, customizer) : undefined;
+    if (guard && isIterateeCall(sources[0], sources[1], guard)) {
+      customizer = length < 3 ? undefined : customizer;
+      length = 1;
+    }
+    object = Object(object);
+    while (++index < length) {
+      var source = sources[index];
+      if (source) {
+        assigner(object, source, customizer);
+      }
+    }
+    return object;
+  });
+}
+
+/**
  * Gets the "length" property value of `object`.
@@ -169,20 +682,339 @@ *
 /**
- * Checks if `value` is array-like.
+ * Gets the native function at `key` of `object`.
  *
  * @private
+ * @param {Object} object The object to query.
+ * @param {string} key The key of the method to get.
+ * @returns {*} Returns the function if it's native, else `undefined`.
+ */
+function getNative(object, key) {
+  var value = object == null ? undefined : object[key];
+  return isNative(value) ? value : undefined;
+}
+
+/**
+ * Creates an array of the own symbol properties of `object`.
+ *
+ * @private
+ * @param {Object} object The object to query.
+ * @returns {Array} Returns the array of symbols.
+ */
+var getSymbols = getOwnPropertySymbols || function() {
+  return [];
+};
+
+/**
+ * Gets the `toStringTag` of `value`.
+ *
+ * @private
+ * @param {*} value The value to query.
+ * @returns {string} Returns the `toStringTag`.
+ */
+function getTag(value) {
+  return objectToString.call(value);
+}
+
+// Fallback for IE 11 providing `toStringTag` values for maps and sets.
+if ((Map && getTag(new Map) != mapTag) || (Set && getTag(new Set) != setTag)) {
+  getTag = function(value) {
+    var result = objectToString.call(value),
+        Ctor = result == objectTag ? value.constructor : null,
+        ctorString = typeof Ctor == 'function' ? funcToString.call(Ctor) : '';
+
+    if (ctorString) {
+      if (ctorString == mapCtorString) {
+        return mapTag;
+      }
+      if (ctorString == setCtorString) {
+        return setTag;
+      }
+    }
+    return result;
+  };
+}
+
+/**
+ * Initializes an array clone.
+ *
+ * @private
+ * @param {Array} array The array to clone.
+ * @returns {Array} Returns the initialized clone.
+ */
+function initCloneArray(array) {
+  var length = array.length,
+      result = array.constructor(length);
+
+  // Add properties assigned by `RegExp#exec`.
+  if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
+    result.index = array.index;
+    result.input = array.input;
+  }
+  return result;
+}
+
+/**
+ * Initializes an object clone.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneObject(object) {
+  var Ctor = object.constructor;
+  return baseCreate(isFunction(Ctor) ? Ctor.prototype : undefined);
+}
+
+/**
+ * Initializes an object clone based on its `toStringTag`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The `toStringTag` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneByTag(object, tag, isDeep) {
+  var Ctor = object.constructor;
+  switch (tag) {
+    case arrayBufferTag:
+      return cloneBuffer(object);
+
+    case boolTag:
+    case dateTag:
+      return new Ctor(+object);
+
+    case float32Tag: case float64Tag:
+    case int8Tag: case int16Tag: case int32Tag:
+    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+      return cloneTypedArray(object, isDeep);
+
+    case mapTag:
+      return cloneMap(object);
+
+    case numberTag:
+    case stringTag:
+      return new Ctor(object);
+
+    case regexpTag:
+      return cloneRegExp(object);
+
+    case setTag:
+      return cloneSet(object);
+
+    case symbolTag:
+      return cloneSymbol(object);
+  }
+}
+
+/**
+ * Checks if the provided arguments are from an iteratee call.
+ *
+ * @private
+ * @param {*} value The potential iteratee value argument.
+ * @param {*} index The potential iteratee index or key argument.
+ * @param {*} object The potential iteratee object argument.
+ * @returns {boolean} Returns `true` if the arguments are from an iteratee call, else `false`.
+ */
+function isIterateeCall(value, index, object) {
+  if (!isObject(object)) {
+    return false;
+  }
+  var type = typeof index;
+  if (type == 'number'
+      ? (isArrayLike(object) && isIndex(index, object.length))
+      : (type == 'string' && index in object)) {
+    return eq(object[index], value);
+  }
+  return false;
+}
+
+/**
+ * Performs a [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
+ * comparison between two values to determine if they are equivalent.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to compare.
+ * @param {*} other The other value to compare.
+ * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
+ * @example
+ *
+ * var object = { 'user': 'fred' };
+ * var other = { 'user': 'fred' };
+ *
+ * _.eq(object, object);
+ * // => true
+ *
+ * _.eq(object, other);
+ * // => false
+ *
+ * _.eq('a', 'a');
+ * // => true
+ *
+ * _.eq('a', Object('a'));
+ * // => false
+ *
+ * _.eq(NaN, NaN);
+ * // => true
+ */
+function eq(value, other) {
+  return value === other || (value !== value && other !== other);
+}
+
+/**
+ * Checks if `value` is likely an `arguments` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
  * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isArguments(function() { return arguments; }());
+ * // => true
+ *
+ * _.isArguments([1, 2, 3]);
+ * // => false
+ */
+function isArguments(value) {
+  // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
+  return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
+    (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
+}
+
+/**
+ * Checks if `value` is classified as an `Array` object.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isArray([1, 2, 3]);
+ * // => true
+ *
+ * _.isArray(document.body.children);
+ * // => false
+ *
+ * _.isArray('abc');
+ * // => false
+ *
+ * _.isArray(_.noop);
+ * // => false
+ */
+var isArray = Array.isArray;
+
+/**
+ * Checks if `value` is array-like. A value is considered array-like if it's
+ * not a function and has a `value.length` that's an integer greater than or
+ * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Lang
+ * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+ * @example
+ *
+ * _.isArrayLike([1, 2, 3]);
+ * // => true
+ *
+ * _.isArrayLike(document.body.children);
+ * // => true
+ *
+ * _.isArrayLike('abc');
+ * // => true
+ *
+ * _.isArrayLike(_.noop);
+ * // => false
  */
 function isArrayLike(value) {
-  return value != null && isLength(getLength(value));
+  return value != null &&
+    !(typeof value == 'function' && isFunction(value)) && isLength(getLength(value));
 }
 
 /**
+ * This method is like `_.isArrayLike` except that it also checks if `value`
+ * is an object.
+ *
+ * @static
+ * @memberOf _
+ * @type Function
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
+ * @example
+ *
+ * _.isArrayLikeObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isArrayLikeObject(document.body.children);
+ * // => true
+ *
+ * _.isArrayLikeObject('abc');
+ * // => false
+ *
+ * _.isArrayLikeObject(_.noop);
+ * // => false
+ */
+function isArrayLikeObject(value) {
+  return isObjectLike(value) && isArrayLike(value);
+}
+
+/**
+ * Checks if `value` is classified as a `Function` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ *
+ * _.isFunction(/abc/);
+ * // => false
+ */
+function isFunction(value) {
+  // The use of `Object#toString` avoids issues with the `typeof` operator
+  // in Safari 8 which returns 'object' for typed array constructors, and
+  // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+  var tag = isObject(value) ? objectToString.call(value) : '';
+  return tag == funcTag || tag == genTag;
+}
+
+/**
  * Checks if `value` is a valid array-like length.
  *
- * **Note:** This function is based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+ * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
  *
- * @private
+ * @static
+ * @memberOf _
+ * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+ * @example
+ *
+ * _.isLength(3);
+ * // => true
+ *
+ * _.isLength(Number.MIN_VALUE);
+ * // => false
+ *
+ * _.isLength(Infinity);
+ * // => false
+ *
+ * _.isLength('3');
+ * // => false
  */
@@ -210,3 +1042,6 @@ function isLength(value) {
  *
- * _.isObject(1);
+ * _.isObject(_.noop);
+ * // => true
+ *
+ * _.isObject(null);
  * // => false
@@ -222,17 +1057,117 @@ */
 /**
- * Recursively merges own enumerable properties of the source object(s), that
- * don't resolve to `undefined` into the destination object. Subsequent sources
- * overwrite property assignments of previous sources. If `customizer` is
- * provided it is invoked to produce the merged values of the destination and
- * source properties. If `customizer` returns `undefined` merging is handled
- * by the method instead. The `customizer` is bound to `thisArg` and invoked
- * with five arguments: (objectValue, sourceValue, key, object, source).
+ * Checks if `value` is object-like. A value is object-like if it's not `null`
+ * and has a `typeof` result of "object".
  *
  * @static
  * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+ * @example
+ *
+ * _.isObjectLike({});
+ * // => true
+ *
+ * _.isObjectLike([1, 2, 3]);
+ * // => true
+ *
+ * _.isObjectLike(_.noop);
+ * // => false
+ *
+ * _.isObjectLike(null);
+ * // => false
+ */
+function isObjectLike(value) {
+  return !!value && typeof value == 'object';
+}
+
+/**
+ * Checks if `value` is a native function.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is a native function, else `false`.
+ * @example
+ *
+ * _.isNative(Array.prototype.push);
+ * // => true
+ *
+ * _.isNative(_);
+ * // => false
+ */
+function isNative(value) {
+  if (value == null) {
+    return false;
+  }
+  if (isFunction(value)) {
+    return reIsNative.test(funcToString.call(value));
+  }
+  return isObjectLike(value) &&
+    (isHostObject(value) ? reIsNative : reIsHostCtor).test(value);
+}
+
+/**
+ * Checks if `value` is classified as a typed array.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isTypedArray(new Uint8Array);
+ * // => true
+ *
+ * _.isTypedArray([]);
+ * // => false
+ */
+function isTypedArray(value) {
+  return isObjectLike(value) && isLength(value.length) && !!typedArrayTags[objectToString.call(value)];
+}
+
+/**
+ * Converts `value` to a plain object flattening inherited enumerable
+ * properties of `value` to own properties of the plain object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to convert.
+ * @returns {Object} Returns the converted plain object.
+ * @example
+ *
+ * function Foo() {
+ *   this.b = 2;
+ * }
+ *
+ * Foo.prototype.c = 3;
+ *
+ * _.assign({ 'a': 1 }, new Foo);
+ * // => { 'a': 1, 'b': 2 }
+ *
+ * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
+ * // => { 'a': 1, 'b': 2, 'c': 3 }
+ */
+function toPlainObject(value) {
+  return copyObject(value, keysIn(value));
+}
+
+/**
+ * Recursively merges own and inherited enumerable properties of source
+ * objects into the destination object, skipping source properties that resolve
+ * to `undefined`. Array and plain object properties are merged recursively.
+ * Other objects and value types are overridden by assignment. Source objects
+ * are applied from left to right. Subsequent sources overwrite property
+ * assignments of previous sources.
+ *
+ * **Note:** This method mutates `object`.
+ *
+ * @static
+ * @memberOf _
  * @category Object
  * @param {Object} object The destination object.
  * @param {...Object} [sources] The source objects.
- * @param {Function} [customizer] The function to customize assigned values.
- * @param {*} [thisArg] The `this` binding of `customizer`.
  * @returns {Object} Returns `object`.
@@ -251,23 +1186,7 @@ * @example
  * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] }
- *
- * // using a customizer callback
- * var object = {
- *   'fruits': ['apple'],
- *   'vegetables': ['beet']
- * };
- *
- * var other = {
- *   'fruits': ['banana'],
- *   'vegetables': ['carrot']
- * };
- *
- * _.merge(object, other, function(a, b) {
- *   if (_.isArray(a)) {
- *     return a.concat(b);
- *   }
- * });
- * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] }
  */
-var merge = createAssigner(baseMerge);
+var merge = createAssigner(function(object, source) {
+  baseMerge(object, source);
+});
 
 module.exports = merge;

package.json

 {
   "name": "lodash.merge",
-  "version": "3.3.2",
-  "description": "The modern build of lodash’s `_.merge` as a module.",
+  "version": "4.0.0",
+  "description": "The lodash method `_.merge` exported as a module.",
   "homepage": "https://lodash.com/",
   "icon": "https://lodash.com/icon.svg",
   "license": "MIT",
-  "keywords": "lodash, lodash-modularized, stdlib, util",
+  "keywords": "lodash, lodash-modularized, stdlib, util, merge",
   "author": "John-David Dalton <[e-mail]> (http://allyoucanleet.com/)",
   "contributors": [
     "John-David Dalton <[e-mail]> (http://allyoucanleet.com/)",
-    "Benjamin Tan <[e-mail]> (https://d10.github.io/)",
-    "Blaine Bublitz <[e-mail]> (http://www.iceddev.com/)",
-    "Kit Cambridge <[e-mail]> (http://kitcambridge.be/)",
+    "Blaine Bublitz <[e-mail]> (https://github.com/phated)",
     "Mathias Bynens <[e-mail]> (https://mathiasbynens.be/)"
@@ -20,14 +18,10 @@ ],
   "dependencies": {
-    "lodash._arraycopy": "^3.0.0",
     "lodash._arrayeach": "^3.0.0",
-    "lodash._createassigner": "^3.0.0",
-    "lodash._getnative": "^3.0.0",
-    "lodash.isarguments": "^3.0.0",
-    "lodash.isarray": "^3.0.0",
-    "lodash.isplainobject": "^3.0.0",
-    "lodash.istypedarray": "^3.0.0",
-    "lodash.keys": "^3.0.0",
-    "lodash.keysin": "^3.0.0",
-    "lodash.toplainobject": "^3.0.0"
+    "lodash._basefor": "^3.0.0",
+    "lodash._stack": "^3.0.0",
+    "lodash.isplainobject": "^4.0.0",
+    "lodash.keys": "^4.0.0",
+    "lodash.keysin": "^4.0.0",
+    "lodash.rest": "^4.0.0"
   }
 }

README.md

@@ -1,4 +0,4 @@
-# lodash.merge v3.3.2
+# lodash.merge v4.0.0
 
-The [modern build](https://github.com/lodash/lodash/wiki/Build-Differences) of [lodash’s](https://lodash.com/) `_.merge` exported as a [Node.js](http://nodejs.org/)/[io.js](https://iojs.org/) module.
+The [lodash](https://lodash.com/) method `_.merge` exported as a [Node.js](https://nodejs.org/) module.
 
@@ -8,3 +8,2 @@ ## Installation
 Using npm:
-
 ```bash
@@ -15,4 +14,3 @@ $ {sudo -H} npm i -g npm
 
-In Node.js/io.js:
-
+In Node.js:
 ```js
@@ -22,2 +20,2 @@ var merge = require('lodash.merge');
 
-See the [documentation](https://lodash.com/docs#merge) or [package source](https://github.com/lodash/lodash/blob/3.3.2-npm-packages/lodash.merge) for more details.
+See the [documentation](https://lodash.com/docs#merge) or [package source](https://github.com/lodash/lodash/blob/4.0.0-npm-packages/lodash.merge) for more details.

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Improved metrics

Total package byte prevSize

35863

increased by208.74%

Dependency count

7

decreased by-36.36%

Lines of code

1092

increased by336.8%

Worsened metrics

Number of lines in readme file

19

decreased by-9.52%

Number of medium supply chain risk alerts

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increased byInfinity%

Dependency changes

• + Addedlodash._basefor@^3.0.0

• + Addedlodash._stack@^3.0.0

• + Addedlodash.rest@^4.0.0

• + Addedlodash.isplainobject@4.0.6(transitive)

• + Addedlodash.keys@4.2.0(transitive)

• + Addedlodash.keysin@4.2.0(transitive)

• + Addedlodash.rest@4.0.5(transitive)

• - Removedlodash._arraycopy@^3.0.0

• - Removedlodash._createassigner@^3.0.0

• - Removedlodash._getnative@^3.0.0

• - Removedlodash.isarguments@^3.0.0

• - Removedlodash.isarray@^3.0.0

• - Removedlodash.istypedarray@^3.0.0

• - Removedlodash.toplainobject@^3.0.0

• - Removedlodash._arraycopy@3.0.0(transitive)

• - Removedlodash._basecopy@3.0.1(transitive)

• - Removedlodash._bindcallback@3.0.1(transitive)

• - Removedlodash._createassigner@3.1.1(transitive)

• - Removedlodash._getnative@3.9.1(transitive)

• - Removedlodash._isiterateecall@3.0.9(transitive)

• - Removedlodash.isarguments@3.1.0(transitive)

• - Removedlodash.isarray@3.0.4(transitive)

• - Removedlodash.isplainobject@3.2.0(transitive)

• - Removedlodash.istypedarray@3.0.6(transitive)

• - Removedlodash.keys@3.1.2(transitive)

• - Removedlodash.keysin@3.0.8(transitive)

• - Removedlodash.restparam@3.6.1(transitive)

• - Removedlodash.toplainobject@3.0.0(transitive)

• Updatedlodash.isplainobject@^4.0.0

• Updatedlodash.keys@^4.0.0

• Updatedlodash.keysin@^4.0.0