'use strict';
|
var bind = require('../internals/function-bind-context');
|
var uncurryThis = require('../internals/function-uncurry-this');
|
var IndexedObject = require('../internals/indexed-object');
|
var toObject = require('../internals/to-object');
|
var lengthOfArrayLike = require('../internals/length-of-array-like');
|
var MapHelpers = require('../internals/map-helpers');
|
|
var Map = MapHelpers.Map;
|
var mapGet = MapHelpers.get;
|
var mapHas = MapHelpers.has;
|
var mapSet = MapHelpers.set;
|
var push = uncurryThis([].push);
|
|
// `Array.prototype.groupToMap` method
|
// https://github.com/tc39/proposal-array-grouping
|
module.exports = function groupToMap(callbackfn /* , thisArg */) {
|
var O = toObject(this);
|
var self = IndexedObject(O);
|
var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
|
var map = new Map();
|
var length = lengthOfArrayLike(self);
|
var index = 0;
|
var key, value;
|
for (;length > index; index++) {
|
value = self[index];
|
key = boundFunction(value, index, O);
|
if (mapHas(map, key)) push(mapGet(map, key), value);
|
else mapSet(map, key, [value]);
|
} return map;
|
};
|
