rustlings

solving rustlings ft. dracuxan
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lifetimes1.rs (699B)

      1 // The Rust compiler needs to know how to check whether supplied references are
      2 // valid, so that it can let the programmer know if a reference is at risk of
      3 // going out of scope before it is used. Remember, references are borrows and do
      4 // not own their own data. What if their owner goes out of scope?
      5 
      6 fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
      7     //    ^^^^     ^^          ^^          ^^
      8     if x.len() > y.len() { x } else { y }
      9 }
     10 
     11 fn main() {
     12     // You can optionally experiment here.
     13 }
     14 
     15 #[cfg(test)]
     16 mod tests {
     17     use super::*;
     18 
     19     #[test]
     20     fn test_longest() {
     21         assert_eq!(longest("abcd", "123"), "abcd");
     22         assert_eq!(longest("abc", "1234"), "1234");
     23     }
     24 }