random-excuse.js

let who = ['The dog','My grandma','His turtle','My bird'];
let action = ['ate','peed','crushed','broke'];
let what = ['my homework', 'the keys', 'the car'];
let when = ['before the class','right on time','when I finished','during my lunch','while I was praying', "yesterday"];


function randomIndex (arr) {
  return Math.floor(Math.random() * arr.length);
}

function randomValue (arr) {
  const rIndex = randomIndex(arr);
  return arr[rIndex];
}

function randomExcuse (arrayWho, arrayAction, arrayWhat, arrayWhen) {
  return randomValue(arrayWho) + ' ' + randomValue(arrayAction) + ' ' 
            + randomValue(arrayWhat) + ' ' + randomValue(arrayWhen);
}