Math.floor () to round down to nearest 0.5 in javascript

Question

I have a function from excel that I use: =FLOOR(value,0.5)

With this function, I round DOWN to the nearest half value. For example:

10.55 becomes 10.5 10.99 becomes 10.5 10.2 becomes 10

Etc.

Is there an equivalent in javascript? I know that Math.floor () will round down to the nearest integer. However, does anyone know of a good way to round down to the nearest 0.5 instead?

Thank you in advance

https://stackoverflow.com/questions/6137986/javascript-roundoff-number-to-nearest-0-5 <-- same basic idea — epascarello, Feb 06 '20 at 02:25
I was thinking of a more generic , if all things were perfict — Phillip Williams, Feb 06 '20 at 02:35

score 2 · Answer 1 · answered Feb 06 '20 at 02:35

2

Here's your function:

function slipFloor(num){
  let f = Math.floor(num);
  if(num-f < 0.5){
    return f;
  }
  return f+0.5;
}
console.log(slipFloor(10.55));
console.log(slipFloor(10.99));
console.log(slipFloor(10.2));

answered Feb 06 '20 at 02:35

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This works very well, thank you! – Elise Chemist Feb 06 '20 at 13:20

Math.floor () to round down to nearest 0.5 in javascript

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