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JavaScript-Interview-Question/EventLoopOutput.js at master · namitmalasi/JavaScript-Interview-Question · GitHub

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// The output of below code will be 0-8 but the terminal cursor does not get free.

// It means that that the output is displayed but the program kept running.

// It is because we have not cleared the interval.

let a = true;

let count = 0;

setTimeout(() => {

a = false;

}, 2000);

setInterval(() => {

if (a) {

console.log(count++);

}

}, 200);

// The output of the below code will infinite loop because the value a never becomes false.

// This happens due to Event loop.

let a = true;

let count = 0;

setTimeout(() => {

a = false;

}, 2000);

while (a) {

console.log(count++);

}

// The output of below code will be 0-8 and the cursor gets free meaning that,

// the program has fiished executing or running.

let count = 0;

let id = setInterval(() => {

console.log(count++);

}, 200);

setTimeout(() => {

clearInterval(id);

}, 2000);

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