| // 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] |
| ---*/ |
| 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); |
| } |
| checkAssertions().then($DONE, $DONE); |