rounding - How to round up a number in Javascript?

Question

I want to use Javascript to round up a number. Since the number is currency, I want it to round up like in these examples (2 decimal points):

• 192.168 => 192.20
• 192.11 => 192.20
• 192.21 => 192.30
• 192.26 => 192.30
• 192.20 => 192.20

How to achieve this using Javascript? The built-in Javascript function will round up the number based on standard logic (less and more than 5 to round up).

Answer 1

/**
 * @param num The number to round
 * @param precision The number of decimal places to preserve
 */
function roundUp(num, precision) {
  precision = Math.pow(10, precision)
  return Math.ceil(num * precision) / precision
}

roundUp(192.168, 1) //=> 192.2