Check a text prefix or suffix

startswith and endswith borrow strings and return bool without allocating. Matches are literal and case-sensitive; an empty prefix or suffix always matches.

def main() -> Result[(), IoError]:
    name = "report.plenty"
    print(name.startswith("report"))?
    print(name.endswith(".plenty"))?
    print(name.endswith(".PLENTY"))?
    print("".startswith(""))?
    Ok(())

True
True
False
True

Each method takes one string, including a reference. Bounds and lists or tuples of alternative patterns are not supported yet.