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snippets/js/s/compose.md

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+---
+title: Compose functions
+type: snippet
+language: javascript
+tags: [function]
+cover: digital-nomad-16
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+Performs right-to-left function composition.
+
+- Use `Array.prototype.reduce()` to perform right-to-left function composition.
+- The last (rightmost) function can accept one or more arguments; the remaining functions must be unary.
+
+```js
+const compose = (...fns) =>
+  fns.reduce((f, g) => (...args) => f(g(...args)));
+```
+
+```js
+const add5 = x => x + 5;
+const multiply = (x, y) => x * y;
+const multiplyAndAdd5 = compose(
+  add5,
+  multiply
+);
+multiplyAndAdd5(5, 2); // 15
+```