Constantly check if date is in the past

Question

I want to check if selected date is in the past in 'for loop'. But if I use 'for loop' it stops other code from running. How can I constantly check if date is in the past and not stopping other code from running?

for (var now = new Date();;) {
   if (selectedDate < now) { 
      // some code
   }
}

console.log('1') // code that's not running.

Answer 1

JavaScript is fully synchronous and single-threaded. Therefore, your code is getting "locked-up" or stuck at the for loop you have referenced.

You need to use setInterval . For example:

 // For demonstration purposes. var selectedDate = new Date(); // The code inside of this function will run every 1 second (or 1,000 milliseconds) setInterval(function () { var now = new Date(); if (selectedDate < now) { console.log("Selected date is in the past!"); } }, 1000); console.log('1') // This code runs now because JavaScript is not caught executing the for loop. 

Answer 2

Lot of solutions for resolve this problem. You can use an Observable if ou use RXJS. Else you can use a simple interval with an arrow function or a simple funtion and define repeat time interval in millisecond :

setInterval(repeatFunc,intervalInMillisecond);