Math - Random Integer

random-integer.js

/**
 * This gist is for Javascript beginners.
 * @author: Anthony Du Pont <[email protected]>
 * @site: https://www.twitter.com/JsGists
 *
 * The `Math.random()` method only return a random number between 0 and 1.
 * But what if you want a larger range than [0, 1] ? We need to improve this
 * random method.
 *
 * Example:
 * I want to get a random number from the range [10, 20] inclusive which means that 10 or 20 can come out.
 *
 * Note: This random function works with negative and/or positive range ([0, 10], [-10, 5], [-20, -10]).
 **/

const number = randomInteger(10, 20); // Return a random number between 10 and 20 (10, 5, 7, 3, 20, 17, ...)

function randomInteger(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}