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/// Checks if the string contains only lowercase unicode characters.
///
/// # Arguments
///
/// * `s` - The string to check.
///
/// # Returns
///
/// Returns true if string contains only lowercase unicode character, false if not.
///
/// # Examples
///
/// ```
/// use rufl::string;
///
/// assert_eq!(true, string::is_lowercase("abc"));
///
/// assert_eq!(true, string::is_lowercase("żółć"));
///
/// assert_eq!(false, string::is_lowercase("你好"));
///
/// assert_eq!(false, string::is_lowercase("a̐éö̲"));
///
/// ```
pub fn is_lowercase(s: &str) -> bool {
match s.len() {
0 => false,
_ => {
let mut is_all_lowercase = true;
crate::string::split_graphemes(s)
.into_iter()
.for_each(|item| {
item.chars().for_each(|c| {
if !c.is_lowercase() {
is_all_lowercase = false;
}
})
});
is_all_lowercase
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_is_lowercase() {
assert_eq!(true, is_lowercase("abc"));
assert_eq!(true, is_lowercase("żółć"));
assert_eq!(false, is_lowercase("a̐éö̲"));
assert_eq!(false, is_lowercase("你好"));
assert_eq!(false, is_lowercase(""));
assert_eq!(false, is_lowercase("foo1"));
assert_eq!(false, is_lowercase("Foo"));
}
}