Number.parseInt()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.

The Number.parseInt() static method parses a string argument and returns an integer of the specified radix or base.

Try it

function roughScale(x, base) {
  const parsed = Number.parseInt(x, base);
  if (Number.isNaN(parsed)) {
    return 0;
  }
  return parsed * 100;
}

console.log(roughScale(" 0xF", 16));
// Expected output: 1500

console.log(roughScale("321", 2));
// Expected output: 0

Syntax

js
Number.parseInt(string)
Number.parseInt(string, radix)

Parameters

string

The value to parse, coerced to a string. Leading whitespace in this argument is ignored.

radix Optional

An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string.

If radix is undefined or 0, it is assumed to be 10 except when the number begins with the code unit pairs 0x or 0X, in which case a radix of 16 is assumed.