xpto.md

---

layout: post title: Next circular array item

A function that returns the next item in a given array. Starts over when the last item is reached.

var next = nextCircularItem(['x', 'y', 'z']);

next(); // x
next(); // y
next(); // z
next(); // x
        // etc

function nextCircularItem(arr) {
  var len = arr.length;
  var current = -1;
  return function() {
    var next = current + 1;
    current = next === len ? 0 : next;
    return arr[current];
  };
}