What is the JavaScript version of sleep()? -


is there better way engineer sleep in javascript following pausecomp function (taken here)?

function pausecomp(millis) {     var date = new date();     var curdate = null;     { curdate = new date(); }     while(curdate-date < millis); }

this not duplicate of sleep in javascript - delay between actions; want real sleep in middle of function, , not delay before piece of code executes.

2017 update

since 2009 when question asked, javascript has evolved significantly. other answers obsolete or overly complicated. here current best practice:

function sleep(ms) {   return new promise(resolve => settimeout(resolve, ms)); }  async function demo() {   console.log('taking break...');   await sleep(2000);   console.log('two second later'); }  demo();

this it. await sleep(<duration>).

you can try code live on runkit. note that,

  1. await can executed in functions prefixed async keyword. runkit wraps code in async function before executing it.
  2. await pauses current async function

two new javascript features helped write actual "sleep" function:

compatibility

if reason you're using node older 7, or targeting old browsers, async/await can still used via babel (a tool transpile javascript + new features plain old javascript), transform-async-to-generator plugin. run

npm install babel-cli --save

create .babelrc with:

{   "plugins": [     "transform-async-to-generator",   ] }

then run code with

node_modules/babel-cli/bin/babel-node.js sleep.js

but again, don't need if you're using node 7 or later, or if you're targeting modern browsers.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj...
Read more

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more