Round a number to the nearest multiple of a given value

Divide, round and multiply back.

JavaScript Version 1.0.0 · MIT · .md

function roundNearest({ value, nearest }) { return Math.round(value / nearest) * nearest; }

Input & expected output

{
  "value": 102,
  "nearest": 5
}

100

The edge case

{
  "value": 1.25,
  "nearest": 0.1
}

1.3

Know the limits

• Math.round rounds .5 up, toward +∞. Fractional steps can produce floating-point noise.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Convert degrees to radians — Multiply by π and divide by 180.
• Check if a rectangle contains another one — Compare corners: a contains b when b’s corners sit inside or on a’s edges.
• Check if a rectangle overlaps another one — Two rectangles overlap when they overlap on both axes.