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JS promise : Wrap settimeout in promise

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Warp settimeout function in promise

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  1. var milllisecond = 4000;
  2. function wait(ms){
  3.     console.log('started');
  4.     // new promise
  5.     return new Promise(function(resolve,reject){
  6.         console.log(this);
  7.         window.setTimeout(function(){
  8.             // resolve inside the callback of settimeout
  9.             resolve(ms); 
  10. 	    reject(ms);
  11.         },ms);
  12.     });
  13. };
  14.  
  15. wait(milllisecond).then(finish);
  16.  
  17. function finish(a){
  18. console.log(1+a)
  19. };

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