46 lines
1.3 KiB
JavaScript
46 lines
1.3 KiB
JavaScript
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'use strict';
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var call = require('../internals/function-call');
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var toIntegerOrInfinity = require('../internals/to-integer-or-infinity');
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var getIteratorDirect = require('../internals/get-iterator-direct');
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var INVALID_SIZE = 'Invalid size';
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var $RangeError = RangeError;
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var $TypeError = TypeError;
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var max = Math.max;
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var SetRecord = function (set, size, has, keys) {
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this.set = set;
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this.size = size;
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this.has = has;
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this.keys = keys;
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};
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SetRecord.prototype = {
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getIterator: function () {
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return getIteratorDirect(anObject(call(this.keys, this.set)));
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},
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includes: function (it) {
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return call(this.has, this.set, it);
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}
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};
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// `GetSetRecord` abstract operation
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// https://tc39.es/proposal-set-methods/#sec-getsetrecord
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module.exports = function (obj) {
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anObject(obj);
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var numSize = +obj.size;
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// NOTE: If size is undefined, then numSize will be NaN
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// eslint-disable-next-line no-self-compare -- NaN check
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if (numSize !== numSize) throw $TypeError(INVALID_SIZE);
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var intSize = toIntegerOrInfinity(numSize);
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if (intSize < 0) throw $RangeError(INVALID_SIZE);
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return new SetRecord(
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obj,
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max(intSize, 0),
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aCallable(obj.has),
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aCallable(obj.keys)
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);
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};
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