/**
 * Search through an object and delete any properties supplied in the list.
 * Is case-sensitive and recursive by default. Both can be toggled by passing false.
 * @param  {Object}  r                     original JS object
 * @param  {Array}   properties            list of keys/properties to remove
 * @param  {Boolean} [case_sensitive=true] set to false for case-insensitive
 * @param  {Boolean} [recursive=true]     set to true for recursive
  * @return {Object}                        modified JS object
 */
function remove_properties(r,properties,case_sensitive = true,recursive = true) {
  recursive = (typeof recursive === "undefined" || typeof recursive !== "boolean") ? true : recursive;
  case_sensitive = (typeof case_sensitive === "undefined" || typeof case_sensitive !== "boolean") ? true : case_sensitive;

  if (case_sensitive === false) {
    for (var i = 0; i < properties.length; i++) {
      properties[i] = properties[i].toUpperCase();
    }
  }

  for (var key in r) {
    // Check for recursive cases (array or object)
    if(recursive === true) {
      if (Array.isArray(r[key])) { // if the key is an array
        for (var i = 0; i < r[key].length; i++) {
           r[key][i] = strip_properties(r[key][i],properties,recursive,case_sensitive);
        }
      } else if (typeof r[key] === "object") { // if the key is an object
        r[key] = strip_properties(r[key],properties,recursive,case_sensitive);
      }
    }

    // Check for key to delete
    if (case_sensitive === false) {
      if (properties.indexOf(key.toUpperCase()) != -1) { delete r[key]; }
    } else {
      if (properties.indexOf(key) != -1) { delete r[key]; }
    }
  }
  return r;
}