/**
 * lodash 3.2.1 (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 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 * Available under MIT license <https://lodash.com/license>
 */

/** Used as the `TypeError` message for "Functions" methods. */
var FUNC_ERROR_TEXT = 'Expected a function';

/**
 * A faster alternative to `Function#apply`, this function invokes `func`
 * with the `this` binding of `thisArg` and the arguments of `args`.
 *
 * @private
 * @param {Function} func The function to invoke.
 * @param {*} thisArg The `this` binding of `func`.
 * @param {...*} [args] The arguments to invoke `func` with.
 * @returns {*} Returns the result of `func`.
 */
function apply(func, thisArg, args) {
  var length = args ? args.length : 0;
  switch (length) {
    case 0: return func.call(thisArg);
    case 1: return func.call(thisArg, args[0]);
    case 2: return func.call(thisArg, args[0], args[1]);
    case 3: return func.call(thisArg, args[0], args[1], args[2]);
  }
  return func.apply(thisArg, args);
}

/**
 * Creates a function that invokes `func` with the `this` binding of the created
 * function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3).
 *
 * **Note:** This method is based on the [spread operator](https://mdn.io/spread_operator).
 *
 * @static
 * @memberOf _
 * @category Function
 * @param {Function} func The function to spread arguments over.
 * @returns {Function} Returns the new function.
 * @example
 *
 * var say = _.spread(function(who, what) {
 *   return who + ' says ' + what;
 * });
 *
 * say(['fred', 'hello']);
 * // => 'fred says hello'
 *
 * // with a Promise
 * var numbers = Promise.all([
 *   Promise.resolve(40),
 *   Promise.resolve(36)
 * ]);
 *
 * numbers.then(_.spread(function(x, y) {
 *   return x + y;
 * }));
 * // => a Promise of 76
 */
function spread(func) {
  if (typeof func != 'function') {
    throw new TypeError(FUNC_ERROR_TEXT);
  }
  return function(array) {
    return apply(func, this, array);
  };
}

module.exports = spread;