So, looping waiting for some variable to change will never work because no other code can run to change that variable. Though JavaScript does not have a sleep function, due to the introduction of Promises and async/await in ES2018, we can end up causing the function to sleep. 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). There are 302 other projects in the npm registry using sleep. Start using sleep in your project by running npm i sleep. If you did try to "pause" by looping, then you'd essentially "hang" the Javascript interpreter for a period of time. Latest version: 6.3.0, last published: 3 years ago. 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. Still, the noticeable drawback is that setTimeout is an asynchronous method, meaning. Unlike other languages, JavaScript doesnt have any sleep () function. Unlike Java or Python, Javascript does not have a built-in sleep function. Java has a thread.sleep (), python has time.sleep (), and GO has time.sleep (cond). function wait(ms)īut, if you have code like this: stateChange(-1) The programming languages such as PHP and C has a sleep(sec) function to pause the execution for a fixed amount of time. JavaScript sleep/wait The programming languages such as PHP and C has a sleep (sec) function to pause the execution for a fixed amount of time. 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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