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snippets/python/s/compose.md

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+---
+title: Compose functions
+type: snippet
+language: python
+tags: [function]
+cover: tram-car-2
+dateModified: 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.
+
+```py
+from functools import reduce
+
+def compose(*fns):
+  return reduce(lambda f, g: lambda *args: f(g(*args)), fns)
+```
+
+```py
+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
+```