CallbackHell

Tag Archives: CallbackHell

Understanding Callbacks 01May, 2015

Understanding Callbacks

I am back with a complicated yet very interesting article on “Callbacks”. First of all, why do we need callbacks? Our javascript is synchronous in its behavior. It works only on a single thread. Each statement executes when the earlier statement is executed. Now the case arise, if one statement takes more time to execute, then the next statement will be halted. For example: 1. console.log(“1”); 2. var result = 0; 3. for(var i=0; i<=100000; i++){ result += i; } 4. console.log(‘3′); So till the time loop doesn’t execute for 100000 statements, it will not execute the 4th statement. But in case we have some event like a ajax call, a file read operation or any other activity than a…

Posted in: JavaScript