chaddy-addr.js

function addr(arr, v, n) {
  var steps = n === 0 ? arr.length-1 : Math.abs(n);
  var step = n < 0 ? -1 : 1;
  var i = n < 0 ? arr.length-1 : 0;
  var count = arr.length-1;

  while(count > 0 && steps > 0) {
    console.log(arr[i])
    if(arr[i] === v) {
      arr[i]++;
      steps--;
    }
    count--;
    i += step;
  }
  return arr;
}

addr([1,2,4,1,1,5], 1, 0)
addr([1,2,4,1,1,5], 1, 2)
addr([1,2,4,1,1,5], 1, -2)

// delete items from array (LREM)
function addr(arr, v, n) {
  var steps = n === 0 ? arr.length-1 : Math.abs(n);
  var step = n < 0 ? -1 : 1;
  var i = n < 0 ? arr.length-1 : 0;
  var count = arr.length-1;

  while(count > 0 && steps > 0) {
    console.log(arr[i])
    if(arr[i] === v) {
      delete arr[i];
      steps--;
    }
    count--;
    i += step;
  }
  return arr.filter(function(){return true});
}