lodash/partialRight.js

define(['./_createWrapper', './_replaceHolders', './rest'], function(createWrapper, replaceHolders, rest) {

  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  var undefined;

  /** Used to compose bitmasks for wrapper metadata. */
  var PARTIAL_RIGHT_FLAG = 64;

  /**
   * This method is like `_.partial` except that partially applied arguments
   * are appended to those provided to the new function.
   *
   * The `_.partialRight.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 greetFred = _.partialRight(greet, 'fred');
   * greetFred('hi');
   * // => 'hi fred'
   *
   * // Partially applied with placeholders.
   * var sayHelloTo = _.partialRight(greet, 'hello', _);
   * sayHelloTo('fred');
   * // => 'hello fred'
   */
  var partialRight = rest(function(func, partials) {
    var holders = replaceHolders(partials, partialRight.placeholder);
    return createWrapper(func, PARTIAL_RIGHT_FLAG, undefined, partials, holders);
  });

  return partialRight;
});