Round money to nearest 10 dollars in Javascript

Question

How can I round a decimal number in Javascript to the nearest 10? My math is pretty rubbish today, it could be the 2 hour sleep :/

Some sample cases

Answer 1

function round(number, multiplier) {
  multiplier = multiplier || 1;
  return Math.round(number / multiplier) * multiplier;
}

var num1 = 2823.66;
var num2 = 142.11;
var num3 = 9.49;

console.log(
  "%s\n%s\n%s", // just a formating thing
  round(num1, 10), // 2820
  round(num2, 10), // 140
  round(num3, 10)  // 10
);