How do I... Make a timer

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Trying to create a simple timer but cannot get it to work.

JavaScript

var timer = -50;
    boolean lock = true;

    while(lock == true){
    timer++;
        if(timer == 50){
            lock = false;
        }
    }

    while(lock == false){
    timer--;
        if(timer == -50){
            lock = true;
        }
    }

What I have tried:

When I remove this code my program runs normally.

Posted 21-Feb-18 9:38am

Member 13689719

Updated 21-Feb-18 14:40pm

Bryian Tan

v2

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j snooze 21-Feb-18 17:21pm

Why would you not use the javascript setInterval function? Its got a built in timer you can tell it to run a function every x milliseconds?
Example...this would run every 3 seconds(since the time parameter is in milliseconds)

setInterval(function(){ alert("Hello World!"); }, 3000);

A_Griffin 21-Feb-18 18:55pm

What are you expecting your code to do? All I can see is a variable (timer) that, in the blink of an eye, will "count" from -50 to +50 and back again, then the code ends.

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Patrice T · Answer 1 · 2018-02-21T14:12:00

Quote:
When I remove this code my program runs normally.

You forgot to tell what is the problem with this code.

Quote:
Trying to create a simple timer but cannot get it to work.

As far as I can see, this code only hog CPU. Its problem is that its speed is different on every computer and with today computers, it will be so fast you will barely see something.

As of today every computer offer some efficient timing service which is used for every anime you see, even video.
Window setInterval() Method[^]