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ant/examples/spec/async_loops.js
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async_loops.js
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			import { test, summary } from './helpers.js';

			console.log('Async Loop Closure Tests\n');

			let results = {};

			function delay(ms) {
			return new Promise(resolve => setTimeout(resolve, ms));
			}

			async function testForLetClosure() {
			const fns = [];
			for (let i = 0; i < 3; i++) {
			await delay(5);
			fns.push(() => i);
			}
			return fns.map(f => f()).join(',');
			}
			testForLetClosure().then(v => {
			results.forLetClosure = v;
			});

			async function testBlockScopedCapture() {
			const fns = [];
			for (let i = 0; i < 3; i++) {
			const captured = i * 10;
			await delay(5);
			fns.push(() => captured);
			}
			return fns.map(f => f()).join(',');
			}
			testBlockScopedCapture().then(v => {
			results.blockScopedCapture = v;
			});

			async function testNestedLoops() {
			const fns = [];
			for (let i = 0; i < 2; i++) {
			for (let j = 0; j < 2; j++) {
			const captured = `${i}-${j}`;
			await delay(5);
			fns.push(() => captured);
			}
			}
			return fns.map(f => f()).join(',');
			}
			testNestedLoops().then(v => {
			results.nestedLoops = v;
			});

			async function testWhileLoop() {
			let i = 0;
			const values = [];
			while (i < 3) {
			const captured = i;
			await delay(5);
			values.push(captured);
			i++;
			}
			return values.join(',');
			}
			testWhileLoop().then(v => {
			results.whileLoop = v;
			});

			async function testMultipleAwaits() {
			const fns = [];
			for (let i = 0; i < 3; i++) {
			const captured = i;
			await delay(5);
			await delay(5);
			fns.push(() => captured);
			}
			return fns.map(f => f()).join(',');
			}
			testMultipleAwaits().then(v => {
			results.multipleAwaits = v;
			});

			async function loopTask(id) {
			const taskResults = [];
			for (let i = 0; i < 3; i++) {
			const captured = `${id}:${i}`;
			await delay(5);
			taskResults.push(() => captured);
			}
			return taskResults.map(fn => fn());
			}

			async function testSequentialTasks() {
			const a = await loopTask('A');
			const b = await loopTask('B');
			return { a: a.join(','), b: b.join(',') };
			}
			testSequentialTasks().then(v => {
			results.sequentialTasks = v;
			});

			async function testAsyncArrowInLoop() {
			const fns = [];
			for (let i = 0; i < 3; i++) {
			const captured = i;
			fns.push(async () => {
			await delay(5);
			return captured;
			});
			}
			const values = await Promise.all(fns.map(f => f()));
			return values.join(',');
			}
			testAsyncArrowInLoop().then(v => {
			results.asyncArrowInLoop = v;
			});

			async function testTryCatchInLoop() {
			const values = [];
			for (let i = 0; i < 3; i++) {
			const captured = i;
			try {
			await delay(5);
			values.push(captured);
			} catch (e) {
			values.push('error');
			}
			}
			return values.join(',');
			}
			testTryCatchInLoop().then(v => {
			results.tryCatchInLoop = v;
			});

			async function testDoWhile() {
			let i = 0;
			const values = [];
			do {
			const captured = i;
			await delay(5);
			values.push(captured);
			i++;
			} while (i < 3);
			return values.join(',');
			}
			testDoWhile().then(v => {
			results.doWhile = v;
			});

			async function testConditionalAwait() {
			const fns = [];
			for (let i = 0; i < 3; i++) {
			const captured = i;
			if (i % 2 === 0) {
			await delay(5);
			}
			fns.push(() => captured);
			}
			return fns.map(f => f()).join(',');
			}
			testConditionalAwait().then(v => {
			results.conditionalAwait = v;
			});

			async function inner(id, val) {
			const arr = [];
			for (let i = 0; i < 2; i++) {
			await delay(1);
			arr.push(`${id}:${val}:${i}`);
			}
			return arr;
			}

			async function outer(id) {
			const taskResults = [];
			for (let j = 0; j < 2; j++) {
			await delay(1);
			const r = await inner(id, j);
			taskResults.push(...r);
			}
			return taskResults;
			}

			Promise.all([outer('A'), outer('B'), outer('C')]).then(([a, b, c]) => {
			results.nestedAsyncA = a.join(',');
			results.nestedAsyncB = b.join(',');
			results.nestedAsyncC = c.join(',');
			});

			setTimeout(() => {
			test('for-let with async closure', results.forLetClosure, '0,1,2');
			test('block-scoped capture', results.blockScopedCapture, '0,10,20');
			test('nested loops', results.nestedLoops, '0-0,0-1,1-0,1-1');
			test('while loop const', results.whileLoop, '0,1,2');
			test('multiple awaits per iteration', results.multipleAwaits, '0,1,2');
			test('sequential tasks A', results.sequentialTasks.a, 'A:0,A:1,A:2');
			test('sequential tasks B', results.sequentialTasks.b, 'B:0,B:1,B:2');
			test('async arrow in loop', results.asyncArrowInLoop, '0,1,2');
			test('try-catch in loop', results.tryCatchInLoop, '0,1,2');
			test('do-while with const', results.doWhile, '0,1,2');
			test('conditional await', results.conditionalAwait, '0,1,2');
			test('nested async calls A', results.nestedAsyncA, 'A:0:0,A:0:1,A:1:0,A:1:1');
			test('nested async calls B', results.nestedAsyncB, 'B:0:0,B:0:1,B:1:0,B:1:1');
			test('nested async calls C', results.nestedAsyncC, 'C:0:0,C:0:1,C:1:0,C:1:1');
			summary();
			}, 200);

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