Bump to v4.0.0.

bind.js

@@ -0,0 +1,53 @@
+import createWrapper from './internal/createWrapper';
+import replaceHolders from './internal/replaceHolders';
+import rest from './rest';
+
+/** Used to compose bitmasks for wrapper metadata. */
+var BIND_FLAG = 1,
+    PARTIAL_FLAG = 32;
+
+/**
+ * Creates a function that invokes `func` with the `this` binding of `thisArg`
+ * and prepends any additional `_.bind` arguments to those provided to the
+ * bound function.
+ *
+ * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
+ * may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** Unlike native `Function#bind` this method doesn't set the "length"
+ * property of bound functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to bind.
+ * @param {*} thisArg The `this` binding of `func`.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new bound function.
+ * @example
+ *
+ * var greet = function(greeting, punctuation) {
+ *   return greeting + ' ' + this.user + punctuation;
+ * };
+ *
+ * var object = { 'user': 'fred' };
+ *
+ * var bound = _.bind(greet, object, 'hi');
+ * bound('!');
+ * // => 'hi fred!'
+ *
+ * // using placeholders
+ * var bound = _.bind(greet, object, _, '!');
+ * bound('hi');
+ * // => 'hi fred!'
+ */
+var bind = rest(function(func, thisArg, partials) {
+  var bitmask = BIND_FLAG;
+  if (partials.length) {
+    var holders = replaceHolders(partials, bind.placeholder);
+    bitmask |= PARTIAL_FLAG;
+  }
+  return createWrapper(func, bitmask, thisArg, partials, holders);
+});
+
+export default bind;