# Reverse compose functions

Canonical: https://www.wiki.jodisand.me/snippets/python/compose_right/


Performs left-to-right function composition.

- Use `functools.reduce()` to perform left-to-right function composition.
- The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.

```py
from functools import reduce

def compose_right(*fns):
  return reduce(lambda f, g: lambda *args: g(f(*args)), fns)
```

```py
add = lambda x, y: x + y
square = lambda x: x * x
add_and_square = compose_right(add, square)
add_and_square(1, 2) # 9
```