40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
var baseRest = require('./_baseRest'),
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toInteger = require('./toInteger');
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/** Error message constants. */
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var FUNC_ERROR_TEXT = 'Expected a function';
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/**
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* Creates a function that invokes `func` with the `this` binding of the
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* created function and arguments from `start` and beyond provided as
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* an array.
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*
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* **Note:** This method is based on the
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* [rest parameter](https://mdn.io/rest_parameters).
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Function
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* @param {Function} func The function to apply a rest parameter to.
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* @param {number} [start=func.length-1] The start position of the rest parameter.
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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 = _.rest(function(what, names) {
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* return what + ' ' + _.initial(names).join(', ') +
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* (_.size(names) > 1 ? ', & ' : '') + _.last(names);
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* });
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*
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* say('hello', 'fred', 'barney', 'pebbles');
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* // => 'hello fred, barney, & pebbles'
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*/
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function rest(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 === undefined ? start : toInteger(start);
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return baseRest(func, start);
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}
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module.exports = rest;
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