Wrapping around an array

example.js

const magicNumber = 3;
const dataArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];

let index = 0;

while (true) {
  // This is where you get the current item
  // I'm just printing it but you can do anything
  console.log(dataArray[index]);

  // Perform some check on whether to keep going
  if (dataArray[index] === 3) {
    break;
  }

  // Increase the `current` value by the magic number
  // Use modulo to wrap around
  index = (index + magicNumber) % dataArray.length
}