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- 'use strict';
- // https://tc39.github.io/proposal-setmap-offrom/
- var bind = require('../internals/function-bind-context');
- var anObject = require('../internals/an-object');
- var toObject = require('../internals/to-object');
- var iterate = require('../internals/iterate');
-
- module.exports = function (C, adder, ENTRY) {
- return function from(source /* , mapFn, thisArg */) {
- var O = toObject(source);
- var length = arguments.length;
- var mapFn = length > 1 ? arguments[1] : undefined;
- var mapping = mapFn !== undefined;
- var boundFunction = mapping ? bind(mapFn, length > 2 ? arguments[2] : undefined) : undefined;
- var result = new C();
- var n = 0;
- iterate(O, function (nextItem) {
- var entry = mapping ? boundFunction(nextItem, n++) : nextItem;
- if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
- else adder(result, entry);
- });
- return result;
- };
- };
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