30-seconds-of-code/snippets/compose.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Compose functions	function	blog_images/tram-car-2.jpg	2020-01-02T15:51:20+02:00	2020-11-02T19:27:07+02:00

Performs right-to-left function composition.

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

from functools import reduce

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

add5 = lambda x: x + 5
multiply = lambda x, y: x * y
multiply_and_add_5 = compose(add5, multiply)
multiply_and_add_5(5, 2) # 15