How to convert decimal numbers to binary in JavaScript

Question

I do not understande code below which is used to convert decimal number to a binary.

function dec2bin(dec){
  return (dec >>> 0).toString(2);
}

console.log(dec2bin(-5));

Answer 1

dec >>> 0 is an unsigned 32-bit right-shift of zero.

This has the effect of

a) truncating the non-integer part of the number

b) converting the number to 32-bit

c) removing the sign bit from the 32-bit number

someNumber.toString(2)

will convert to a string representation of the binary value of someNumber.

Answer 2

function dismailToBinary(num) {
  let binary = "";
  while (num > 0) {
    let digit = num % 2;
    binary = "" + digit + binary;
    num = parseInt(num / 2);
  }
  return binary;
}
console.log(dismailToBinary(5));

function decimalToBinary(num) {
  let binary = "";
  while (num > 0) {
    let digit = num % 2;
    binary = "" + digit + binary;
    num = parseInt(num / 2);
  }
  return binary;
}
console.log(decimalToBinary(5));