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snippets/pipe-functions.md

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+---
+title: Pipe functions
+tags: function
+cover: goat-wooden-cottage
+firstSeen: 2017-12-26T19:02:27+02:00
+lastUpdated: 2020-10-22T20:24:04+03:00
+---
+
+Performs left-to-right function composition.
+
+- Use `Array.prototype.reduce()` with the spread operator (`...`) 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 pipeFunctions = (...fns) =>
+  fns.reduce((f, g) => (...args) => g(f(...args)));
+```
+
+```js
+const add5 = x => x + 5;
+const multiply = (x, y) => x * y;
+const multiplyAndAdd5 = pipeFunctions(multiply, add5);
+multiplyAndAdd5(5, 2); // 15
+```