| 1 | 'use strict';
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| 2 |
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| 3 | var bind = require('../internals/function-bind-context');
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| 4 | var anObject = require('../internals/an-object');
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| 5 | var toObject = require('../internals/to-object');
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| 6 | var iterate = require('../internals/iterate');
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| 7 |
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| 8 | module.exports = function (C, adder, ENTRY) {
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| 9 | return function from(source /* , mapFn, thisArg */) {
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| 10 | var O = toObject(source);
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| 11 | var length = arguments.length;
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| 12 | var mapFn = length > 1 ? arguments[1] : undefined;
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| 13 | var mapping = mapFn !== undefined;
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| 14 | var boundFunction = mapping ? bind(mapFn, length > 2 ? arguments[2] : undefined) : undefined;
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| 15 | var result = new C();
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| 16 | var n = 0;
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| 17 | iterate(O, function (nextItem) {
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| 18 | var entry = mapping ? boundFunction(nextItem, n++) : nextItem;
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| 19 | if (ENTRY) adder(result, anObject(entry)[0], entry[1]);
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| 20 | else adder(result, entry);
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| 21 | });
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| 22 | return result;
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| 23 | };
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| 24 | };
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