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test_async.cjs
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test_async.cjs
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// Test async/await functionality
console.log('=== Async/Await Tests ===');
// Test 1: Basic async function
console.log('\nTest 1: Basic async function');
async function basicAsync() {
return 42;
}
basicAsync().then(v => {
console.log('Basic async returned: ' + v);
});
// Test 2: Async arrow function
console.log('\nTest 2: Async arrow function');
const arrowAsync = async () => {
return 'arrow result';
};
arrowAsync().then(v => {
console.log('Arrow async returned: ' + v);
});
// Test 3: Async arrow function with single parameter
console.log('\nTest 3: Async arrow with param');
const singleParamAsync = async x => {
return x * 2;
};
singleParamAsync(21).then(v => {
console.log('Single param async returned: ' + v);
});
// Test 4: Async arrow function with multiple parameters
console.log('\nTest 4: Async arrow with multiple params');
const multiParamAsync = async (a, b) => {
return a + b;
};
multiParamAsync(10, 32).then(v => {
console.log('Multi param async returned: ' + v);
});
// Test 5: Async function with Promise
console.log('\nTest 5: Async function returning Promise');
async function withPromise() {
return Promise.resolve('promise from async');
}
withPromise().then(v => {
console.log('Async with promise: ' + v);
});
// Test 6: Async function with setTimeout
console.log('\nTest 6: Async function with setTimeout');
async function withTimeout() {
setTimeout(() => {
console.log('Timeout inside async executed');
}, 100);
return 'timeout scheduled';
}
withTimeout().then(v => {
console.log('Async with timeout returned: ' + v);
});
// Test 7: Async function with queueMicrotask
console.log('\nTest 7: Async function with queueMicrotask');
async function withMicrotask() {
queueMicrotask(() => {
console.log('Microtask inside async executed');
});
return 'microtask queued';
}
withMicrotask().then(v => {
console.log('Async with microtask returned: ' + v);
});
// Test 8: Async functions must return primitives for now (Promise chaining limitation)
console.log('\nTest 8: Async returning values');
async function chain1() {
return 5;
}
chain1().then(v => {
console.log('Chained async result: ' + v * 2);
});
// Test 9: Async function as callback
console.log('\nTest 9: Async function as callback');
function executor(fn) {
fn().then(v => {
console.log('Callback async result: ' + v);
});
}
executor(async () => {
return 'callback value';
});
// Test 10: Multiple promise chains
console.log('\nTest 10: Multiple promise chains');
Promise.resolve(1)
.then(v => v + 1)
.then(v => v + 1)
.then(v => v + 1)
.then(v => {
console.log('Multiple chains result: ' + v);
});
// Test 11: Async function expression
console.log('\nTest 11: Async function expression');
const asyncExpr = async function () {
return 'expression';
};
asyncExpr().then(v => {
console.log('Async expression result: ' + v);
});
// Test 12: Async function with conditional
console.log('\nTest 12: Async function with conditional');
async function conditional(flag) {
if (flag) {
return 'true branch';
}
return 'false branch';
}
conditional(true).then(v => {
console.log('Conditional async (true): ' + v);
});
conditional(false).then(v => {
console.log('Conditional async (false): ' + v);
});
// Test 13: Async with Promise.resolve
console.log('\nTest 13: Async with Promise.resolve');
async function withResolve() {
return Promise.resolve('resolved value');
}
withResolve().then(v => {
console.log('Async with resolve result: ' + v);
});
// Test 14: Async with object method
console.log('\nTest 14: Async object method');
const obj = {
value: 100,
asyncMethod: async function () {
return this.value;
}
};
obj.asyncMethod().then(v => {
console.log('Async object method: ' + v);
});
// Test 15: Async arrow in object
console.log('\nTest 15: Async arrow in object');
const obj2 = {
value: 200,
asyncArrow: async () => {
return 'arrow in object';
}
};
obj2.asyncArrow().then(v => {
console.log('Async arrow in object: ' + v);
});
console.log('\n=== Synchronous code finished ===');

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