Rust Keyword Arguments, Optional Arguments, and Variable-Arity

I can&#x27;t think of a feature that would help me convince the team to migrate more to Rust.<p>Rust is young; it learns from the mistakes of old languages and picks the best.<p>E.g. Python&#x27;s default arguments were declared once; JavaScript&#x27;s are recreated on each invocation.

These days, this is probably the only thing I miss from python when I write Rust.