loops.js
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loops.js
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	import { test, testDeep, summary } from './helpers.js';

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

	let sum = 0;
	for (let i = 0; i < 5; i++) sum += i;
	test('for loop sum', sum, 10);

	let nested = 0;
	for (let i = 0; i < 3; i++) {
	for (let j = 0; j < 3; j++) {
	nested++;
	}
	}
	test('nested for loops', nested, 9);

	function findFirst(arr, target) {
	for (let i = 0; i < arr.length; i++) {
	if (arr[i] === target) return i;
	}
	return -1;
	}
	test('for loop return', findFirst([10, 20, 30], 20), 1);
	test('for loop return not found', findFirst([10, 20, 30], 99), -1);

	let breakSum = 0;
	for (let i = 0; i < 10; i++) {
	if (i === 5) break;
	breakSum += i;
	}
	test('for loop break', breakSum, 10);

	let evenSum = 0;
	for (let i = 0; i < 10; i++) {
	if (i % 2 === 1) continue;
	evenSum += i;
	}
	test('for loop continue', evenSum, 20);

	let k = 0;
	let extCount = 0;
	for (; k < 5; k++) extCount++;
	test('for loop external init', extCount, 5);

	let countdown = 0;
	for (let i = 5; i > 0; i--) countdown += i;
	test('for loop decrement', countdown, 15);

	let arr = [1, 2, 3, 4, 5];
	for (let i = 0; i < arr.length; i++) arr[i] *= 2;
	testDeep('for loop modify array', arr, [2, 4, 6, 8, 10]);

	let str = 'hello';
	let chars = '';
	for (let i = 0; i < str.length; i++) chars += str[i];
	test('for loop string', chars, 'hello');

	let whileSum = 0;
	let j = 0;
	while (j < 5) {
	whileSum += j;
	j++;
	}
	test('while loop', whileSum, 10);

	let doSum = 0;
	let d = 0;
	do {
	doSum += d;
	d++;
	} while (d < 5);
	test('do-while loop', doSum, 10);

	const obj = { a: 1, b: 2, c: 3 };
	let keys = [];
	for (let key in obj) keys.push(key);
	test('for-in keys length', keys.length, 3);
	test('for-in has a', keys.includes('a'), true);

	const items = [10, 20, 30];
	let forOfSum = 0;
	for (let item of items) forOfSum += item;
	test('for-of sum', forOfSum, 60);

	let forOfChars = '';
	for (let c of 'abc') forOfChars += c;
	test('for-of string', forOfChars, 'abc');

	let largeSum = 0;
	for (let i = 0; i < 1000; i++) largeSum += i;
	test('large loop', largeSum, 499500);

	summary();

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