f2e5e26af3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
21 lines
483 B
Markdown
21 lines
483 B
Markdown
### compose
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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) => 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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