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