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87 lines
2.5 KiB
JavaScript
87 lines
2.5 KiB
JavaScript
/**
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* lodash 4.1.0 (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 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 2009-2016 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 unzip = require('lodash.unzip');
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/**
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* A faster alternative to `Function#apply`, this function invokes `func`
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* with the `this` binding of `thisArg` and the arguments of `args`.
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*
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* @private
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* @param {Function} func The function to invoke.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {Array} args The arguments to invoke `func` with.
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* @returns {*} Returns the result of `func`.
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*/
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function apply(func, thisArg, args) {
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var length = args.length;
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switch (length) {
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case 0: return func.call(thisArg);
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case 1: return func.call(thisArg, args[0]);
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case 2: return func.call(thisArg, args[0], args[1]);
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case 3: return func.call(thisArg, args[0], args[1], args[2]);
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}
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return func.apply(thisArg, args);
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}
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/**
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* A specialized version of `_.map` for arrays without support for iteratee
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* shorthands.
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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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* @returns {Array} Returns the new mapped array.
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*/
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function arrayMap(array, iteratee) {
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var index = -1,
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length = array.length,
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result = Array(length);
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while (++index < length) {
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result[index] = iteratee(array[index], index, array);
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}
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return result;
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}
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/**
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* This method is like `_.unzip` except that it accepts `iteratee` to specify
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* how regrouped values should be combined. The iteratee is invoked with the
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* elements of each group: (...group).
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*
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* @static
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* @memberOf _
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* @since 3.8.0
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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=_.identity] The function to combine
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* regrouped values.
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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) {
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if (!(array && array.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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return arrayMap(result, function(group) {
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return apply(iteratee, undefined, group);
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});
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}
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module.exports = unzipWith;
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