Clamp a number to a range

Keep a number inside an inclusive minimum and maximum.

JavaScript Version 1.0.0 · MIT · .md

function clamp({ value, min, max }) { return Math.min(max, Math.max(min, value)); }

Input & expected output

{
  "value": 120,
  "min": 0,
  "max": 100
}

100

The edge case

{
  "value": -5,
  "min": 0,
  "max": 100
}

0

Know the limits

• All values must be finite numbers and min must not exceed max.
• Clamping is a product decision; reject invalid input instead when hiding it would be unsafe.

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

• Round to a number of digits — Apply decimal scaling and JavaScript rounding for display-oriented values.
• Add an ordinal suffix to a number — Append st, nd, rd or th to a positive integer.
• Calculate Fibonacci numbers — Return the nth Fibonacci number with memoized recursion.