flow_right()

Create a function that is the composition of functions, executed right to left.

Implementation

Args: *functions: Functions to compose Returns: A function that applies all functions in reverse sequence

Example

                            double = lambda x: x * 2
add_one = lambda x: x + 1
transform = flow_right(double, add_one)
transform(5)  # add_one(5) then double(6) = 12
                        

Expected output: 12

Source Code

                        def flow_right(*functions: Callable) -> Callable:
    for func in functions:
        _validate_callable(func)
    
    if not functions:
        return lambda x: x
    
    def composed(*args, **kwargs):
        result = functions[-1](*args, **kwargs)
        for func in reversed(functions[:-1]):
            result = func(result)
        return result
    
    # Set _argcount for compatibility with tests
    composed._argcount = functions[-1].__code__.co_argcount if functions else 0 # type: ignore
    composed.__name__ = f"flow_right({', '.join(f.__name__ for f in functions)})"
    return composed
                    