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snippets/compose-right.md

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+---
+title: Reverse compose functions
+tags: function
+cover: rocky-beach
+firstSeen: 2018-01-23T22:12:56+02:00
+lastUpdated: 2020-10-22T20:23:47+03:00
+---
+
+Performs left-to-right function composition.
+
+- Use `Array.prototype.reduce()` to perform left-to-right function composition.
+- The first (leftmost) function can accept one or more arguments; the remaining functions must be unary.
+
+```js
+const composeRight = (...fns) =>
+  fns.reduce((f, g) => (...args) => g(f(...args)));
+```
+
+```js
+const add = (x, y) => x + y;
+const square = x => x * x;
+const addAndSquare = composeRight(add, square);
+addAndSquare(1, 2); // 9
+```