Returns next array item. Circular.

next.js

var nextArrayItem = function(arr) {
  var len = arr.length;
  return function(current) {
    var currentIndex = arr.indexOf(current);
    return currentIndex + 1 === len 
      ? arr[0] : arr[currentIndex + 1]
  };
}

var nextStatus = nextArrayItem(['fred', 'angela', 'mark']);

nextStatus('fred') // angela
nextStatus('angela') // mark
nextStatus('mark') // fred