From b4f5f3bc39fb2187c042ad2fa514e51d1261b4d1 Mon Sep 17 00:00:00 2001 From: Hunter Kvalevog Date: Sun, 27 Sep 2026 16:27:24 -0500 Subject: rustlings: complete 16 --- rustlings/solutions/16_lifetimes/lifetimes1.rs | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) (limited to 'rustlings/solutions/16_lifetimes/lifetimes1.rs') diff --git a/rustlings/solutions/16_lifetimes/lifetimes1.rs b/rustlings/solutions/16_lifetimes/lifetimes1.rs index dcf2377..4f56834 100644 --- a/rustlings/solutions/16_lifetimes/lifetimes1.rs +++ b/rustlings/solutions/16_lifetimes/lifetimes1.rs @@ -1,4 +1,24 @@ +// The Rust compiler needs to know how to check whether supplied references are +// valid, so that it can let the programmer know if a reference is at risk of +// going out of scope before it is used. Remember, references are borrows and do +// not own their own data. What if their owner goes out of scope? + +fn longest<'a>(x: &'a str, y: &'a str) -> &'a str { + // ^^^^ ^^ ^^ ^^ + if x.len() > y.len() { x } else { y } +} + fn main() { - // DON'T EDIT THIS SOLUTION FILE! - // It will be automatically filled after you finish the exercise. + // You can optionally experiment here. +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_longest() { + assert_eq!(longest("abcd", "123"), "abcd"); + assert_eq!(longest("abc", "1234"), "1234"); + } } -- cgit v1.2.3