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async.js
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async.js
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import { test, summary } from './helpers.js';
console.log('Async/Await Tests\n');
let results = {};
async function basicAsync() {
return 42;
}
basicAsync().then(v => { results.basic = v; });
const arrowAsync = async () => 'arrow result';
arrowAsync().then(v => { results.arrow = v; });
const singleParam = async x => x * 2;
singleParam(21).then(v => { results.singleParam = v; });
const multiParam = async (a, b) => a + b;
multiParam(10, 32).then(v => { results.multiParam = v; });
async function withPromise() {
return Promise.resolve('promise from async');
}
withPromise().then(v => { results.withPromise = v; });
async function conditional(flag) {
if (flag) return 'true branch';
return 'false branch';
}
conditional(true).then(v => { results.condTrue = v; });
conditional(false).then(v => { results.condFalse = v; });
const obj = {
value: 100,
asyncMethod: async function () {
return this.value;
}
};
obj.asyncMethod().then(v => { results.objMethod = v; });
Promise.resolve(1)
.then(v => v + 1)
.then(v => v + 1)
.then(v => v + 1)
.then(v => { results.chain = v; });
async function awaiter() {
const a = await Promise.resolve(1);
const b = await Promise.resolve(2);
return a + b;
}
awaiter().then(v => { results.awaiter = v; });
async function awaitValue() {
return await 42;
}
awaitValue().then(v => { results.awaitValue = v; });
setTimeout(() => {
test('basic async', results.basic, 42);
test('arrow async', results.arrow, 'arrow result');
test('single param async', results.singleParam, 42);
test('multi param async', results.multiParam, 42);
test('with promise', results.withPromise, 'promise from async');
test('conditional true', results.condTrue, 'true branch');
test('conditional false', results.condFalse, 'false branch');
test('object method', results.objMethod, 100);
test('promise chain', results.chain, 4);
test('awaiter sum', results.awaiter, 3);
test('await value', results.awaitValue, 42);
summary();
}, 50);

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