for_loop_braceless.js

let counter = 0;
for (let i = 0; i <= 10; i += 1)
    counter += i;
console.assertEqual(counter, 55);

let counterWithVar = 0;
for (var varI = 0; varI <= 10; varI += 1)
    counterWithVar += varI;
console.assertEqual(counterWithVar, 55);

let noInitCounter = 0;
let noInitI = 5;
for (; noInitI > 0; noInitI -= 1)
    noInitCounter += 1;
console.assertEqual(noInitI, 0);
console.assertEqual(noInitCounter, 5);

function returnInside() {
    for (let i = 3; i -= 1;)
        return i;
    console.assertNotReached();
}
console.assertEqual(returnInside(), 2);

function returnInside2() {
    for (let i = 0;; i += 1)
        if (i >= 10)
            return i;
    console.assertNotReached();
}
console.assertEqual(returnInside2(), 10);

let emptyBody = false;
for (; !emptyBody; emptyBody = true);
console.assert(emptyBody);

let exprAsInitialiser1Idx = false;
for (1 + 1; !exprAsInitialiser1Idx; exprAsInitialiser1Idx = true);
console.assert(exprAsInitialiser1Idx);

let exprAsInitialiser2 = 0;
let exprAsInitialiser2Idx = 0;
for (exprAsInitialiser2 += 1; exprAsInitialiser2Idx < 3; exprAsInitialiser2Idx += 1);
console.assertEqual(exprAsInitialiser2, 1);
console.assertEqual(exprAsInitialiser2Idx, 3);

let exprAsInitialiser5Idx = 0;
let exprAsInitialiser5Counter = 0;
for (false; exprAsInitialiser5Idx < 3; exprAsInitialiser5Idx += 1) exprAsInitialiser5Counter += 1;
console.assertEqual(exprAsInitialiser5Idx, 3);
console.assertEqual(exprAsInitialiser5Counter, 3);

let exprAsInitialiser4 = 0;
for (exprAsInitialiser4 += 1; false;) console.assertNotReached();
console.assertEqual(exprAsInitialiser4, 1);

let exprAsInitialiser5Called = 0;
function expressionAsInitialiser5() {
    exprAsInitialiser5Called += 1;
}
for (expressionAsInitialiser5(); false;) console.assertNotReached();
console.assertEqual(exprAsInitialiser5Called, 1);