starts_with_ignore_ascii_case()

Author: jwodder

src/strings/starts_with_ignore_ascii_case.rs

@@ -0,0 +1,26 @@
+/// Returns `true` if `s` starts with `prefix`, ignoring ASCII case differences
+pub fn starts_with_ignore_ascii_case(s: &str, prefix: &str) -> bool {
+    s.get(..prefix.len())
+        .is_some_and(|t| prefix.eq_ignore_ascii_case(t))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use rstest::rstest;
+
+    #[rstest]
+    #[case("Hello, World!", "hello", true)]
+    #[case("Hello, World!", "HELLO", true)]
+    #[case("hello, world!", "HELLO", true)]
+    #[case("hello", "hello world", false)]
+    #[case("Hellö, World!", "hello", false)]
+    #[case("Hello, Wörld!", "hello", true)]
+    #[case("", "hello", false)]
+    #[case("Holla, World!", "hello", false)]
+    #[case("Hello", "hello", true)]
+    #[case("Hell", "hello", false)]
+    fn test(#[case] s: &str, #[case] prefix: &str, #[case] r: bool) {
+        assert_eq!(starts_with_ignore_ascii_case(s, prefix), r);
+    }
+}