Where can I find the “clamp” function in .NET?

Question

I would like to clamp a value x to a range [a, b]:

x = (x < a) ? a : ((x > b) ? b : x);

This is quite basic

Answer 1

You could write an extension method:

public static T Clamp(this T val, T min, T max) where T : IComparable
{
    if (val.CompareTo(min) < 0) return min;
    else if(val.CompareTo(max) > 0) return max;
    else return val;
}

Extension methods go in static classes - since this is quite a low-level function, it should probably go in some core namespace in your project. You can then use the method in any code file that contains a using directive for the namespace e.g.

using Core.ExtensionMethods

int i = 4.Clamp(1, 3);

.NET Core 2.0

Starting with .NET Core 2.0 System.Math now has a Clamp method that can be used instead:

using System;

int i = Math.Clamp(4, 1, 3);