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rustlings/solutions/13_error_handling/errors1.rs

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fn generate_nametag_text(name: String) -> Result<String, String> {
// ^^^^^^ ^^^^^^
if name.is_empty() {
// `Err(String)` instead of `None`.
Err("Empty names aren't allowed".to_string())
} else {
// `Ok` instead of `Some`.
Ok(format!("Hi! My name is {name}"))
}
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn generates_nametag_text_for_a_nonempty_name() {
assert_eq!(
generate_nametag_text("Beyoncé".to_string()).as_deref(),
Ok("Hi! My name is Beyoncé"),
);
}
#[test]
fn explains_why_generating_nametag_text_fails() {
assert_eq!(
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generate_nametag_text(String::new())
.as_ref()
.map_err(|e| e.as_str()),
Err("Empty names aren't allowed"),
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);
}
}