code: function findLastIndex(array, exp) {
  
    if(!isArray(array) || isUndefined(exp)) {
      return array;
    }
    //return the the index of the last member
    var index = (array.length - 1) - findInArray(reverse(array), $parse(exp), true);
    //if it's a NaN
    return index === index ? index : -1;
  }
docs: @name findLastIndex
  @kind function
  
  @description
  Iterate over the given array and return the index of the last member that the expression
  returns truthy for