Question

How to add leading zeros to a number in JavaScript

Answer 1

function addLeadingZeros(num, len) {
  	return String(num).padStart(len, '0');
}

console.log(addLeadingZeros(4, 2)); 
console.log(addLeadingZeros(5, 3)); 
console.log(addLeadingZeros(2, 4)); 
console.log(addLeadingZeros(1000, 3)); 
  
  
  
  
/*
run:
  
"04"
"005"
"0002"
"1000"
  
*/

 

70+ SQL courses for beginners and professionals