1
0
Fork 0
mirror of https://github.com/notohh/rustlings.git synced 2024-12-21 16:08:09 -05:00
rustlings/exercises/16_lifetimes/lifetimes1.rs

29 lines
732 B
Rust
Raw Normal View History

2022-07-15 08:01:32 -04:00
// 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?
2022-07-15 08:01:32 -04:00
2024-06-27 07:24:21 -04:00
// TODO: Fix the compiler error by updating the function signature.
2022-07-15 08:01:32 -04:00
fn longest(x: &str, y: &str) -> &str {
if x.len() > y.len() {
x
} else {
y
}
}
fn main() {
2024-06-27 07:24:21 -04:00
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
2022-07-15 08:01:32 -04:00
2024-06-27 07:24:21 -04:00
#[test]
fn test_longest() {
assert_eq!(longest("abcd", "123"), "abcd");
assert_eq!(longest("abc", "1234"), "1234");
}
2022-07-15 08:01:32 -04:00
}