js get leading zero code example
Example 1: javascript print int with leading zeros
function padLeadingZeros(num, size) {
var s = num+"";
while (s.length < size) s = "0" + s;
return s;
}
padLeadingZeros(57, 3);// "057"
padLeadingZeros(57, 4); //"0057"
Example 2: js num to string with leading 0
String(<number>).padStart(<places>, '0')
String(42).padStart(5, '0'); // '00042'