Bump to v4.2.0.

lodash.concat/index.js

@@ -1,13 +1,12 @@
 /**
- * lodash 4.1.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.2.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
- * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
+ * Copyright jQuery Foundation and other contributors <https://jquery.org/>
+ * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
- * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
- * Available under MIT license <https://lodash.com/license>
+ * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  */
-var baseFlatten = require('lodash._baseflatten'),
-    rest = require('lodash.rest');
+var baseFlatten = require('lodash._baseflatten');
 
 /**
  * Creates a new array concatenating `array` with `other`.
@@ -33,12 +32,32 @@ function arrayConcat(array, other) {
   return result;
 }
 
+/**
+ * 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;
+}
+
 /**
  * Creates a new array concatenating `array` with any additional arrays
  * and/or values.
  *
  * @static
  * @memberOf _
+ * @since 4.0.0
  * @category Array
  * @param {Array} array The array to concatenate.
  * @param {...*} [values] The values to concatenate.
@@ -54,23 +73,72 @@ function arrayConcat(array, other) {
  * console.log(array);
  * // => [1]
  */
-var concat = rest(function(array, values) {
-  if (!isArray(array)) {
-    array = array == null ? [] : [Object(array)];
+function concat() {
+  var length = arguments.length,
+      array = castArray(arguments[0]);
+
+  if (length < 2) {
+    return length ? copyArray(array) : [];
   }
-  values = baseFlatten(values, 1);
-  return arrayConcat(array, values);
-});
+  var args = Array(length - 1);
+  while (length--) {
+    args[length - 1] = arguments[length];
+  }
+  return arrayConcat(array, baseFlatten(args, 1));
+}
+
+/**
+ * Casts `value` as an array if it's not one.
+ *
+ * @static
+ * @memberOf _
+ * @since 4.4.0
+ * @category Lang
+ * @param {*} value The value to inspect.
+ * @returns {Array} Returns the cast array.
+ * @example
+ *
+ * _.castArray(1);
+ * // => [1]
+ *
+ * _.castArray({ 'a': 1 });
+ * // => [{ 'a': 1 }]
+ *
+ * _.castArray('abc');
+ * // => ['abc']
+ *
+ * _.castArray(null);
+ * // => [null]
+ *
+ * _.castArray(undefined);
+ * // => [undefined]
+ *
+ * _.castArray();
+ * // => []
+ *
+ * var array = [1, 2, 3];
+ * console.log(_.castArray(array) === array);
+ * // => true
+ */
+function castArray() {
+  if (!arguments.length) {
+    return [];
+  }
+  var value = arguments[0];
+  return isArray(value) ? value : [value];
+}
 
 /**
  * Checks if `value` is classified as an `Array` object.
  *
  * @static
  * @memberOf _
+ * @since 0.1.0
  * @type {Function}
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @returns {boolean} Returns `true` if `value` is correctly classified,
+ *  else `false`.
  * @example
  *
  * _.isArray([1, 2, 3]);