15 lines
455 B
Markdown
15 lines
455 B
Markdown
### Compose functions
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Use `Array.reduce()` with the spread operator (`...`) to perform right-to-;eft 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) => fns.reduce((f, g) => (...args) => f(g(...args)));
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/*
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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(add5, multiply)
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multiplyAndAdd5(5, 2) -> 15
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*/
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```
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