This commit is contained in:
bwstudio
2025-10-22 08:19:00 +08:00
parent 467b04e5b0
commit 97fbfe08d7
6040 changed files with 529099 additions and 9685 deletions
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'use strict';
var $TypeError = require('es-errors/type');
var GetIteratorFlattenable = require('../aos/GetIteratorFlattenable');
var OrdinaryHasInstance = require('es-abstract/2024/OrdinaryHasInstance');
var OrdinaryObjectCreate = require('es-abstract/2024/OrdinaryObjectCreate');
var $Iterator = require('../Iterator/polyfill')();
var $WrapForValidIteratorPrototype = require('../WrapForValidIteratorPrototype');
var SLOT = require('internal-slot');
module.exports = function from(O) {
if (this instanceof from) {
throw new $TypeError('`Iterator.from` is not a constructor');
}
var iteratorRecord = GetIteratorFlattenable(O, 'ITERATE-STRINGS'); // step 1
var hasInstance = OrdinaryHasInstance($Iterator, iteratorRecord['[[Iterator]]']); // step 2
if (hasInstance) { // step 3
return iteratorRecord['[[Iterator]]']; // step 3.a
}
var wrapper = OrdinaryObjectCreate($WrapForValidIteratorPrototype); // , ['[[Iterated]]']); // step 4
SLOT.set(wrapper, '[[Iterated]]', iteratorRecord); // step 5
return wrapper; // step 6
};