How can I use JavaScript to limit a number between a min/max value?
like this
var number = Math.min(Math.max(parseInt(number), 1), 20);Live Demo:
function limitNumberWithinRange(num, min, max){ const MIN = min || 1; const MAX = max || 20; const parsed = parseInt(num) return Math.min(Math.max(parsed, MIN), MAX)}alert( limitNumberWithinRange( prompt("enter a number") ))
You have at least two options:
You can use a pair of conditional operators (? :):
number = number > 100 ? 100 : number < 0 ? 0 : number;Or you can combine Math.max and Math.min:
number = Math.min(100, Math.max(0, number));In both cases, it's relatively easy to confuse yourself, so you might consider having a utility function if you do this in multiple places:
function clamp(val, min, max) { return val > max ? max : val < min ? min : val;}Then:
number = clamp(number, 0, 100);