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