get.js

// array-like only
function get(arr, i) {
  var len = arr.length;

  i = i % len;
  if (i < 0) {
    i += len;
  }
  return arr[i];
}

// get([0,1,2], -1) = 2
// get([0,1,2], -2) = 1
// get([0,1,2], 3) = 0
// get([0,1,2], 4) = 1