unary()

Create a function that accepts only the first argument, ignoring others.

Implementation

Args: func: The function to cap arguments for Returns: A function that accepts only one argument

Example

                            def add_all(*args):
    return sum(args)
first_only = unary(add_all)
first_only(1, 2, 3, 4)  # Only uses first argument
                        

Expected output: 1

Source Code

                        def unary(func: Callable) -> Callable:
    _validate_callable(func)
    
    def wrapper(arg, *ignored_args, **kwargs):
        return func(arg, **kwargs)
    
    return _copy_function_metadata(wrapper, func)
                    