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74 lines
2.4 KiB
JavaScript
74 lines
2.4 KiB
JavaScript
/**
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* lodash 3.8.0 (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 arrayMap = require('lodash._arraymap'),
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bindCallback = require('lodash._bindcallback'),
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unzip = require('lodash.unzip');
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/**
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* A specialized version of `_.reduce` for arrays without support for callback
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* shorthands and `this` binding.
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*
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* @private
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* @param {Array} array The array to iterate over.
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* @param {Function} iteratee The function invoked per iteration.
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* @param {*} [accumulator] The initial value.
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* @param {boolean} [initFromArray] Specify using the first element of `array`
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* as the initial value.
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* @returns {*} Returns the accumulated value.
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*/
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function arrayReduce(array, iteratee, accumulator, initFromArray) {
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var index = -1,
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length = array.length;
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if (initFromArray && length) {
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accumulator = array[++index];
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}
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while (++index < length) {
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accumulator = iteratee(accumulator, array[index], index, array);
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}
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return accumulator;
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}
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/**
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* This method is like `_.unzip` except that it accepts an iteratee to specify
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* how regrouped 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} array The array of grouped elements to process.
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* @param {Function} [iteratee] The function to combine regrouped values.
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* @param {*} [thisArg] The `this` binding of `iteratee`.
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* @returns {Array} Returns the new array of regrouped elements.
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* @example
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*
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* var zipped = _.zip([1, 2], [10, 20], [100, 200]);
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* // => [[1, 10, 100], [2, 20, 200]]
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*
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* _.unzipWith(zipped, _.add);
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* // => [3, 30, 300]
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*/
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function unzipWith(array, iteratee, thisArg) {
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var length = array ? array.length : 0;
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if (!length) {
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return [];
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}
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var result = unzip(array);
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if (iteratee == null) {
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return result;
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}
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iteratee = bindCallback(iteratee, thisArg, 4);
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return arrayMap(result, function(group) {
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return arrayReduce(group, iteratee, undefined, true);
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});
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}
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module.exports = unzipWith;
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