Learn how to create random integers using JavaScript / TypeScript.

 

/** * Returns a random int between * @param start inclusive * @param before exclusive */export function randomInt(start: number, before: number) {  return start + Math.floor(Math.random() * (before - start));}

 

import { randomInt } from './random';test("Should not include ceiling", () => {  const res = [];  for (let index = 0; index < 100; index++) {    res.push(randomInt(0, 5));  }  expect(res.some(x => x === 5)).toBeFalsy();});test("Should include one before ceiling", () => {  const res = [];  for (let index = 0; index < 100; index++) {    res.push(randomInt(0, 5));  }  expect(res.some(x => x === 4)).toBeTruthy();});