Performance deep dive

In this approach, we'll find out how to most efficiently determine if a string is a Pangram in C#.

The approaches page lists two idiomatic approaches to this exercise:

1. Using All with Contains on lowercased letters
2. Using All with Contains having case-insensitive comparison

For our performance investigation, we'll also include a third approach: using a bit Field to keep track of used letters.

Benchmarks

To benchmark the approaches, we wrote a small benchmark application using BenchmarkDotNet library.

Comparing the lower-cased characters is over six times faster than doing a case-insensitive comparison. Using a bit field is more than six times faster than using ToLower, but it may be considered to be more idiomatic of the C language than C#.