mirror of
https://github.com/rust-lang/rustlings.git
synced 2024-12-12 11:14:55 +02:00
29 lines
732 B
Rust
29 lines
732 B
Rust
// 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?
|
|
|
|
// TODO: Fix the compiler error by updating the function signature.
|
|
fn longest(x: &str, y: &str) -> &str {
|
|
if x.len() > y.len() {
|
|
x
|
|
} else {
|
|
y
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
// 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");
|
|
}
|
|
}
|