whole_func_string: function (element) {
      for (var i = 0, len = this.length; i < len; i++) {
        if (element === this[i]) {
          return true;
        }
      }
      return false;
    }
func_code_string: function (element) {
      for (var i = 0, len = this.length; i < len; i++) {
        if (element === this[i]) {
          return true;
        }
      }
      return false;
    }
func_documentation_string: Check if an element is in the list
  
  @param element
  @returns {boolean}