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41 lines
1.2 KiB
JavaScript
41 lines
1.2 KiB
JavaScript
9 years ago
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var baseFlatten = require('../internal/baseFlatten'),
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createWrapper = require('../internal/createWrapper'),
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restParam = require('./restParam');
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/** Used to compose bitmasks for wrapper metadata. */
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var REARG_FLAG = 256;
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/**
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* Creates a function that invokes `func` with arguments arranged according
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* to the specified indexes where the argument value at the first index is
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* provided as the first argument, the argument value at the second index is
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* provided as the second argument, and so on.
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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 rearrange arguments for.
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* @param {...(number|number[])} indexes The arranged argument indexes,
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* specified as individual indexes or arrays of indexes.
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* @returns {Function} Returns the new function.
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* @example
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*
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* var rearged = _.rearg(function(a, b, c) {
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* return [a, b, c];
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* }, 2, 0, 1);
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*
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* rearged('b', 'c', 'a')
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* // => ['a', 'b', 'c']
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*
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* var map = _.rearg(_.map, [1, 0]);
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* map(function(n) {
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* return n * 3;
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* }, [1, 2, 3]);
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* // => [3, 6, 9]
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*/
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var rearg = restParam(function(func, indexes) {
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return createWrapper(func, REARG_FLAG, undefined, undefined, undefined, baseFlatten(indexes));
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});
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module.exports = rearg;
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