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63 lines
1.7 KiB
63 lines
1.7 KiB
import apply from './_apply.js'; |
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import arrayPush from './_arrayPush.js'; |
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import baseRest from './_baseRest.js'; |
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import castSlice from './_castSlice.js'; |
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import toInteger from './toInteger.js'; |
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/** Error message constants. */ |
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var FUNC_ERROR_TEXT = 'Expected a function'; |
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/* Built-in method references for those with the same name as other `lodash` methods. */ |
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var nativeMax = Math.max; |
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/** |
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* Creates a function that invokes `func` with the `this` binding of the |
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* create function and an array of arguments much like |
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* [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply). |
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* |
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* **Note:** This method is based on the |
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* [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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* @since 3.2.0 |
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* @category Function |
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* @param {Function} func The function to spread arguments over. |
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* @param {number} [start=0] The start position of the spread. |
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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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* 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, start) { |
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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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start = start == null ? 0 : nativeMax(toInteger(start), 0); |
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return baseRest(function(args) { |
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var array = args[start], |
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otherArgs = castSlice(args, 0, start); |
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if (array) { |
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arrayPush(otherArgs, array); |
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} |
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return apply(func, this, otherArgs); |
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}); |
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} |
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export default spread;
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