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// |reftest| skip-if(!this.hasOwnProperty('Iterator'))
//
//
/*---
esid: pending
description: Lazy %Iterator.prototype% method calls can be interleaved.
info: >
Iterator Helpers proposal 2.1.5
features: [iterator-helpers]
---*/
class TestIterator extends Iterator {
value = 0;
next() {
return {done: false, value: this.value++};
}
}
function unwrapResult(result) {
return result;
}
const methods = [
iter => iter.map(x => x),
iter => iter.filter(x => true),
iter => iter.take(2),
iter => iter.drop(0),
iter => iter.flatMap(x => [x]),
];
for (const firstMethod of methods) {
for (const secondMethod of methods) {
const iterator = new TestIterator();
const firstHelper = firstMethod(iterator);
const secondHelper = secondMethod(iterator);
let firstResult = unwrapResult(firstHelper.next());
assertEq(firstResult.done, false);
assertEq(firstResult.value, 0);
let secondResult = unwrapResult(secondHelper.next());
assertEq(secondResult.done, false);
assertEq(secondResult.value, 1);
firstResult = unwrapResult(firstHelper.next());
assertEq(firstResult.done, false);
assertEq(firstResult.value, 2);
secondResult = unwrapResult(secondHelper.next());
assertEq(secondResult.done, false);
assertEq(secondResult.value, 3);
}
}
if (typeof reportCompare == 'function')
reportCompare(0, 0);
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