Formatting a number with exactly two decimals in JavaScript

Question

I have this line of code which rounds my numbers to two decimal places. But I get numbers like this: 10.8, 2.4, etc. These are not my idea of two decimal places so how I can

Answer 1

Round your decimal value, then use toFixed(x) for your expected digit(s).

function parseDecimalRoundAndFixed(num,dec){
  var d =  Math.pow(10,dec);
  return (Math.round(num * d) / d).toFixed(dec);
}

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Call

parseDecimalRoundAndFixed(10.800243929,4) => 10.80 parseDecimalRoundAndFixed(10.807243929,2) => 10.81