Number formatting, remove thousands separator

Question

I wish to format a number so that it has "leading zeros" (thus string is always equal length). - While I could as backup do this manually I wish to use the best option. - As a standard format syntax (like pythons "{0:4d}".format(number) ) seems to be unavailable, the next best is to use the internationalization library?

I've tried doing this in a fiddle: https://jsfiddle.net/f4202ne3/1/

let fmt = new Intl.NumberFormat('en-US', 
  {minimumIntegerDigits: 4,
  maximumFractionDigits: 0
});
m = 1;
n = 5001

console.log(m.toString(), fmt.format(m)) //"0001"
console.log(n.toString(), fmt.format(n)) ///"5000"

However this displays "5,000" and "0,001". How do I set the thousands separator to a value ( '' )?

Answer 1

Simply set the useGrouping option to false

let fmt = new Intl.NumberFormat('en-US', {
  minimumIntegerDigits: 4,
  maximumFractionDigits: 0,
  useGrouping: false
});

Answer 2

You can use the .pad string method ( https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/padStart )

"1231".padStart(8,0)//00001231
"131".padStart(8,0)//00000131