47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
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'use strict';
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var $TypeError = require('es-errors/type');
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var Call = require('es-abstract/2023/Call');
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var CreateIterResultObject = require('es-abstract/2023/CreateIterResultObject');
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var GetMethod = require('es-abstract/2023/GetMethod');
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var Type = require('es-abstract/2023/Type');
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var SLOT = require('internal-slot');
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var iterProto = require('../Iterator.prototype/implementation');
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// https://tc39.es/proposal-iterator-helpers/#sec-wrapforvaliditeratorprototype-object
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module.exports = /* GetIntrinsic('%WrapForValidIteratorPrototype%', true) || */ {
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__proto__: iterProto,
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next: function next() {
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var O = this; // step 1
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// RequireInternalSlot(O, [[Iterated]]); // step 2
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SLOT.assert(O, '[[Iterated]]');
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var iteratorRecord = SLOT.get(O, '[[Iterated]]'); // step 3
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return Call(iteratorRecord['[[NextMethod]]'], iteratorRecord['[[Iterator]]']); // step 4
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},
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'return': function () {
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var O = this; // step 1
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// RequireInternalSlot(O, [[Iterated]]); // step 2
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SLOT.assert(O, '[[Iterated]]');
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var iterator = SLOT.get(O, '[[Iterated]]')['[[Iterator]]']; // step 3
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if (Type(iterator) !== 'Object') {
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throw new $TypeError('iterator must be an Object'); // step 4
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}
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var returnMethod = GetMethod(iterator, 'return'); // step 5
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if (typeof returnMethod === 'undefined') { // step 6
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return CreateIterResultObject(undefined, true); // step 6.a
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}
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return Call(returnMethod, iterator); // step 7
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}
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};
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