Something like that is possible with JavaScript. By itself, setTimeout () does not work as a sleep () function, but you can create a custom JavaScript sleep () function using async and await. You may need certain lines of code to execute at a point in the future, when you explicitly specify, rather than all the code executing synchronously. J avaScript may not have a sleep () or wait () function, but it is easy enough to create one using the built-in setTimeout () function as long as you are careful with how you use it. setTimeout () Dionysia Lemonaki Sometimes you might want to delay the execution of your code. So, looping waiting for some variable to change will never work because no other code can run to change that variable. JavaScript Wait How to Sleep N Seconds in JS with. Because Javascript runs your code in only a single thread, when you're looping nothing else can run (no other event handlers can get called). If you did try to "pause" by looping, then you'd essentially "hang" the Javascript interpreter for a period of time. Instead, any code that you want to run delays must be inside the setTimeout() callback function (or called from that function). You cannot just pause javascript execution for a predetermined amount of time. It will not wait until after the timeout fires in the stateChange() function. The console.log() statement will run immediately. function wait(ms)īut, if you have code like this: stateChange(-1) However, if in some non-production case you really want to hang the main thread for a period of time, this will do it. Joseph Silber has demonstrated that well in his answer. You really shouldn't be doing this, the correct use of timeout is the right tool for the OP's problem and any other occasion where you just want to run something after a period of time.
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