capitalize() would fail if first char were not ascii.

Enhanced version using chain iterator.

1 files changed, 11 insertions, 2 deletions

diff --git a/src/main.rs b/src/main.rs
index a76b378..c33924d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -25,12 +25,21 @@ use std::string::ToString;
 mod locale;
 
 fn capitalize(s: &str) -> String {
-    match s.chars().next() {
-        Some(ch) => ch.to_uppercase().collect::<String>() + &s[1..],
+    let mut chars = s.chars();
+    match chars.next() {
+        Some(ch) => ch.to_uppercase().chain(chars).collect::<String>(),
         None => String::new(),
     }
 }
 
+#[test]
+fn test_capitalize() {
+    assert_eq!("Flaccid", capitalize("flaccid"));
+    assert_eq!("Ångström", capitalize("ångström"));
+    assert_eq!("Å i lofoten", capitalize("å i lofoten"));
+    assert_eq!("Ååååh", capitalize("ååååh"));
+}
+
 fn print_entry(d: &serde_yaml::Value) {
     let name = d.get("name").unwrap();
     println!("{}", capitalize(name.as_str().unwrap()));