Core Beginner

04  Strings & slices

Two string types: String owns its text, &str borrows a view of it. Slice out the first word, then build a fresh String from a borrowed one.

Step 2 / 2

Build an owned String in shout: uppercase the input and add "!".

Hints
  • to_uppercase() on a &str already allocates a new String.
  • format!("{}!", ...) glues on the bang.
04_strings.rs
Reset to starterCompiled in a sandbox; hidden checks must pass.
Reveal solution
fn shout(s: &str) -> String {
    format!("{}!", s.to_uppercase())
}