Rounding up to the nearest 0.05 in JavaScript

Question

Question
Does anyone know of a way to round a float to the nearest 0.05 in JavaScript?

Example

BEFORE | AFTER         


        

Answer 1

I would write a function that does it for you by

• move the decimal over two places (multiply by 100)
• then mod (%) that inflatedNumber by 5 and get the remainder
• subtract the remainder from 5 so that you know what the 'gap'(ceilGap) is between your number and the next closest .05

• finally, divide your inflatedNumber by 100 so that it goes back to your original float, and voila, your num will be rounded up to the nearest .05.

  function calcNearestPointZeroFive(num){
      var inflatedNumber = num*100,
          remainder     = inflatedNumber % 5;
          ceilGap       = 5 - remainder
  
      return (inflatedNumber + ceilGap)/100
  }
  

If you want to leave numbers like 5.50 untouched you can always add this checker:

if (remainder===0){
    return num
} else {
    var ceilGap  = 5 - remainder
    return (inflatedNumber + ceilGap)/100
}