Bump to v4.0.0.

partial.js

@@ -0,0 +1,45 @@
+import createWrapper from './internal/createWrapper';
+import replaceHolders from './internal/replaceHolders';
+import rest from './rest';
+
+/** Used to compose bitmasks for wrapper metadata. */
+var PARTIAL_FLAG = 32;
+
+/**
+ * Creates a function that invokes `func` with `partial` arguments prepended
+ * to those provided to the new function. This method is like `_.bind` except
+ * it does **not** alter the `this` binding.
+ *
+ * The `_.partial.placeholder` value, which defaults to `_` in monolithic
+ * builds, may be used as a placeholder for partially applied arguments.
+ *
+ * **Note:** This method doesn't set the "length" property of partially
+ * applied functions.
+ *
+ * @static
+ * @memberOf _
+ * @category Function
+ * @param {Function} func The function to partially apply arguments to.
+ * @param {...*} [partials] The arguments to be partially applied.
+ * @returns {Function} Returns the new partially applied function.
+ * @example
+ *
+ * var greet = function(greeting, name) {
+ *   return greeting + ' ' + name;
+ * };
+ *
+ * var sayHelloTo = _.partial(greet, 'hello');
+ * sayHelloTo('fred');
+ * // => 'hello fred'
+ *
+ * // using placeholders
+ * var greetFred = _.partial(greet, _, 'fred');
+ * greetFred('hi');
+ * // => 'hi fred'
+ */
+var partial = rest(function(func, partials) {
+  var holders = replaceHolders(partials, partial.placeholder);
+  return createWrapper(func, PARTIAL_FLAG, undefined, partials, holders);
+});
+
+export default partial;