// Copyright 2019 Google, LLC. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: prod-OptionalExpression
description: >
optional chain RHS of for await statement
info: |
IterationStatement
for await (LeftHandSideExpression of AssignmentExpression) Statement
features: [optional-chaining]
flags: [async]
includes: [asyncHelpers.js]
---*/
const obj = {
iterable: {
[Symbol.asyncIterator]() {
return {
i: 0,
next() {
if (this.i < 3) {
return Promise.resolve({ value: this.i++, done: false });
}
return Promise.resolve({ done: true });
}
};
}
}
};
async function checkAssertions() {
let count = 0;
for await (const num of obj?.iterable) {
count += num;
}
assert.sameValue(3, count);
}
asyncTest(checkAssertions);