Performance deep dive

In this approach, we'll find out how to most efficiently determine the response for Bob in Rust.

The approaches page lists two idiomatic approaches to this exercise:

1. Using if statements.
2. Using match on a tuple.

For our performance investigation, we'll also include a third approach that uses an answer array.

Benchmarks

To benchmark the approaches, we wrote a small benchmark application.

test multiple_line_question_match  ... bench:          96 ns/iter (+/- 17)
test multiple_line_question_if     ... bench:          97 ns/iter (+/- 12)
test multiple_line_question_array  ... bench:         100 ns/iter (+/- 2)

All three approaches are close in performance, but the if statements and match approaches may be considered to be more idiomatic.