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59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
var arrayEvery = require('../internal/arrayEvery'),
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baseFlatten = require('../internal/baseFlatten'),
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baseIsFunction = require('../internal/baseIsFunction'),
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restParam = require('./restParam');
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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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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeMin = Math.min;
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/**
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* Creates a function that runs each argument through a corresponding
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* transform function.
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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 wrap.
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* @param {...(Function|Function[])} [transforms] The functions to transform
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* arguments, specified as individual functions or arrays of functions.
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* @returns {Function} Returns the new function.
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* @example
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*
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* function doubled(n) {
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* return n * 2;
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* }
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*
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* function square(n) {
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* return n * n;
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* }
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*
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* var modded = _.modArgs(function(x, y) {
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* return [x, y];
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* }, square, doubled);
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*
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* modded(1, 2);
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* // => [1, 4]
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*
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* modded(5, 10);
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* // => [25, 20]
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*/
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var modArgs = restParam(function(func, transforms) {
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transforms = baseFlatten(transforms);
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if (typeof func != 'function' || !arrayEvery(transforms, baseIsFunction)) {
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throw new TypeError(FUNC_ERROR_TEXT);
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}
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var length = transforms.length;
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return restParam(function(args) {
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var index = nativeMin(args.length, length);
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while (index--) {
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args[index] = transforms[index](args[index]);
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}
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return func.apply(this, args);
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});
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});
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module.exports = modArgs;
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