Math - Normalization

normalization.js

/**
 * This gist is for Javascript beginners.
 * @author: Anthony Du Pont <[email protected]>
 * @site: https://www.twitter.com/JsGists
 *
 * It's very common in Javascript to normalize numbers. Normalization means that you are taking a number from a range
 * and return a value from 0 to 1 corresponding to the position of this number within this range.
 *
 * If the number is equal to the minimum value of the range, the normal value is 0.
 * If the number is equal to the maximum value of the range, the normal value is 1.
 * If the number is equal to any value in the range, the normal value is any value between 0 and 1.
 *
 * The main idea is to convert this number to a value from 0 to 1. This is really useful for calculation in Javascript.
 *
 * Example:
 * I have a range [20, 40] and I want to get the normal value of 23. 
 **/

const range = [20, 40];
const value = 23;
const normal = norm(value, range[0], range[1]); // Return 0.15

function norm(value, min, max) {
  return (value - min) / (max - min);
}

// Let's check the result in the console.
console.log(normal);

nice!
a linear scale function for input range of 0-1.
its much shorter than the extended version!
(although with the extended version you can also scale back and forth, provided you know the input range)