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snippets/python/s/compose-right.md

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+---
+title: Reverse compose functions
+type: snippet
+language: python
+tags: [function]
+cover: lavender-shelf
+dateModified: 2020-11-02T19:27:07+02:00
+---
+
+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
+```