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es.map.group-by.js
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'use strict'; var $ = require('../internals/export'); var uncurryThis = require('../internals/function-uncurry-this'); var aCallable = require('../internals/a-callable'); var requireObjectCoercible = require('../internals/require-object-coercible'); var iterate = require('../internals/iterate'); var MapHelpers = require('../internals/map-helpers'); var IS_PURE = require('../internals/is-pure'); var Map = MapHelpers.Map; var has = MapHelpers.has; var get = MapHelpers.get; var set = MapHelpers.set; var push = uncurryThis([].push); // `Map.groupBy` method // https://github.com/tc39/proposal-array-grouping $({ target: 'Map', stat: true, forced: IS_PURE }, { groupBy: function groupBy(items, callbackfn) { requireObjectCoercible(items); aCallable(callbackfn); var map = new Map(); var k = 0; iterate(items, function (value) { var key = callbackfn(value, k++); if (!has(map, key)) set(map, key, [value]); else push(get(map, key), value); }); return map; } });