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45 lines
1.6 KiB
JavaScript
45 lines
1.6 KiB
JavaScript
/**
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* lodash 3.8.1 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 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 2009-2015 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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var restParam = require('lodash.restparam'),
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unzipWith = require('lodash.unzipwith');
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/**
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* This method is like `_.zip` except that it accepts an iteratee to specify
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* how grouped values should be combined. The `iteratee` is bound to `thisArg`
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* and invoked with four arguments: (accumulator, value, index, group).
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*
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* @static
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* @memberOf _
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* @category Array
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* @param {...Array} [arrays] The arrays to process.
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* @param {Function} [iteratee] The function to combine grouped values.
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* @param {*} [thisArg] The `this` binding of `iteratee`.
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* @returns {Array} Returns the new array of grouped elements.
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* @example
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*
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* _.zipWith([1, 2], [10, 20], [100, 200], _.add);
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* // => [111, 222]
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*/
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var zipWith = restParam(function(arrays) {
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var length = arrays.length,
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iteratee = length > 2 ? arrays[length - 2] : undefined,
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thisArg = length > 1 ? arrays[length - 1] : undefined;
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if (length > 2 && typeof iteratee == 'function') {
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length -= 2;
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} else {
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iteratee = (length > 1 && typeof thisArg == 'function') ? (--length, thisArg) : undefined;
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thisArg = undefined;
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}
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arrays.length = length;
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return unzipWith(arrays, iteratee, thisArg);
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});
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module.exports = zipWith;
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