mirror of
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75 lines
2.2 KiB
JavaScript
75 lines
2.2 KiB
JavaScript
/**
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* lodash 3.2.1 (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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/** Used as the `TypeError` message for "Functions" methods. */
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var FUNC_ERROR_TEXT = 'Expected a function';
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/**
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* A faster alternative to `Function#apply`, this function invokes `func`
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* with the `this` binding of `thisArg` and the arguments of `args`.
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*
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* @private
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* @param {Function} func The function to invoke.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {...*} [args] The arguments to invoke `func` with.
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* @returns {*} Returns the result of `func`.
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*/
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function apply(func, thisArg, args) {
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var length = args ? args.length : 0;
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switch (length) {
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case 0: return func.call(thisArg);
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case 1: return func.call(thisArg, args[0]);
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case 2: return func.call(thisArg, args[0], args[1]);
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case 3: return func.call(thisArg, args[0], args[1], args[2]);
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}
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return func.apply(thisArg, args);
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}
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/**
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* Creates a function that invokes `func` with the `this` binding of the created
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* function and an array of arguments much like [`Function#apply`](https://es5.github.io/#x15.3.4.3).
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*
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* **Note:** This method is based on the [spread operator](https://mdn.io/spread_operator).
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*
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* @static
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* @memberOf _
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* @category Function
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* @param {Function} func The function to spread arguments over.
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* @returns {Function} Returns the new function.
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* @example
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*
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* var say = _.spread(function(who, what) {
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* return who + ' says ' + what;
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* });
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*
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* say(['fred', 'hello']);
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* // => 'fred says hello'
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*
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* // with a Promise
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* var numbers = Promise.all([
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* Promise.resolve(40),
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* Promise.resolve(36)
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* ]);
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*
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* numbers.then(_.spread(function(x, y) {
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* return x + y;
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* }));
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* // => a Promise of 76
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*/
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function spread(func) {
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if (typeof func != 'function') {
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throw new TypeError(FUNC_ERROR_TEXT);
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}
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return function(array) {
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return apply(func, this, array);
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};
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}
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module.exports = spread;
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