I've seen a bunch of answers on JS about an infinite loop and I thought that it would help for my code but it doesn't seem to be working properly. I have that:
var i = 0
while (true) {
setTimeout(() => {
i ++
console.log('Infinite Loop Test n:', i);
}, 2000)
}
The objective is to get the log every 2 seconds within an infinite loop but I can't seem to be getting anything back... Where am I mistaken?
Thanks in advance for your help as usual!
Why do you want a while loop at all? Either use setInterval, or (better) create a function that calls itself again after a timeout:
function logEvery2Seconds(i) {
setTimeout(() => {
console.log('Infinite Loop Test n:', i);
logEvery2Seconds(++i);
}, 2000)
}
logEvery2Seconds(0);
let i = 0;
setInterval(() => {
console.log('Infinite Loop Test interval n:', i++);
}, 2000)
console.trace() inside the recurring function. You'll notice the stack does not grow. Do the same with a function that does not use setInterval nor setTimeout and you can see the stacktrace growing each iteration.Use Promise and setTimeout.
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
let i = 0;
while(true){
await sleep(3000);//3000ms
i++;
console.log('Infinite Loop Test n:', i);
}
The function you're looking for is setInterval, to use like this:
setInterval(callback, millis)
Here is an example of TypeScript implementation and usage:
interface ILoopContext<T> {
data: T;
state: "RUNNING" | "PAUSED";
}
function loop<T>(
interval: number,
context: ILoopContext<T>,
func: (options: { data: T; start: () => void; stop: () => void }) => void
) {
const stop = () => context.state = "PAUSED";
const start = () => context.state = "RUNNING";
setTimeout(() => {
if (context.state === "RUNNING") {
func({ data: context.data, start, stop });
}
loop(interval, context, func);
}, interval);
return { start, stop };
}
loop(1000, { state: "RUNNING", data: { counter: 0 } }, (options) => {
const { stop, data } = options;
data.counter += 1;
console.log(data.counter);
if (data.counter == 10) {
stop();
}
});
var x = true;
while(x){
console.log("In loop")
}
