Decimal to binary in JavaScript?

Question

actually, I'm an UI developer trainee and my staff told me to write a JavaScript program to convert the decimal numbers to binary numbers, I can convert by manually but I don't know what syntax should I use in js. I've searched it on google but could not found the easily understandable code.

Answer 1

This works with me:

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// Function to convert the number
var toBinary = function(decNum){
return parseInt(decNum,10).toString(2);
}

// Input by user
var num = prompt("Enter number");

// Alert with the function toBinary()
alert(toBinary(num));

--------------------------

(Source of function: StackOverflow)

Answer 2

With a for ciclus 2^x untill you pass the number, the x-1 will give you the highest 1, with a second for continue with the next x-1, untill x is 0.
This is a low level solution.