While Loop Javascript

Loops help you to perform some repetitive task in succession and are often based on the fulfilment of a condition.

In scenarios where we need to perform a repeated operation, writing the repetitive code for every action makes the code redundant and unreadable. Loops are used to keep the code concise and readable wherever there is a need to perform some repeated operations. 

So you saw how complicated situations can be broken down into a series of smaller repeated tasks. Let’s now understand how to write these loops in JavaScript.

while Loop:

while loop is used to create a loop which will be executed as long as a specific statement holds true, which is specified inside the while loop itself. 

Syntax:

while (condition) {
 /*
   body code along with
   statement(s) terminating of the condition at some point in future
 */
}

var num = 1234;

var sum = 0, n = num;

while (n > 0) {
   sum += (n % 10);
   n = Math.floor(n / 10);
}

console.log("Sum of the digits of " + num + " = " + sum);

"Sum of the digits of 1234 = 10"