文件操作 - esnext.map.group-by.js
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文件: /node_modules/core-js/modules/esnext.map.group-by.js
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'use strict'; var $ = require('../internals/export'); var iterate = require('../internals/iterate'); var aFunction = require('../internals/a-function'); // `Map.groupBy` method // https://github.com/tc39/proposal-collection-methods $({ target: 'Map', stat: true }, { groupBy: function groupBy(iterable, keyDerivative) { var newMap = new this(); aFunction(keyDerivative); var has = aFunction(newMap.has); var get = aFunction(newMap.get); var set = aFunction(newMap.set); iterate(iterable, function (element) { var derivedKey = keyDerivative(element); if (!has.call(newMap, derivedKey)) set.call(newMap, derivedKey, [element]); else get.call(newMap, derivedKey).push(element); }); return newMap; } });
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