Randomly print out the items of an array without repeating the last thing printed in JavaScript. https://coderwall.com/p/m_jldw

array-randomizer.js

lastIndex = 0; // Just the first time. Could be a random number too.

setInterval(function(){
  lastIndex = dnr(lastIndex, 10); // 10 being the max.
  console.log(lastIndex);
}, 1000); // Every 1 sec.

// Do not repeat. Never gives the same number twice.
function dnr(lastIndex, length){
  var randIndex = Math.floor((Math.random()*length));

  while (randIndex == lastIndex){
    var randIndex = Math.floor((Math.random()*length));
  }
  return randIndex;
}