I am here, too! I just spent hours on another kata writing an iterative solution that also preserved the data type of "int" rather than first transforming the input to a "string". I was so proud. Once I viewed the solutions, there shined a Linq one-liner. I'm sure there's value in being able to write iterative solutions, but, there comes a point that it just doesn't make as much sense. (Like right now) lol Did you find any good, hard resources for Linq? As of now I'm doing as Aelion and kvarcas91 are suggesting

Or, you can always check other solutions, analyze them and then implement it.

keep rewriting your solutions - practice! :)

1 - The function will be constant and will not change in future uses.
2 - Avoid a new assignment to the variable due to an error in the programming.