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snippets/js/s/curry.md

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+---
+title: Curry function
+type: snippet
+language: javascript
+tags: [function,recursion]
+cover: rocky-beach-2
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+Curries a function.
+
+- Use recursion.
+- If the number of provided arguments (`args`) is sufficient, call the passed function `fn`.
+- Otherwise, use `Function.prototype.bind()` to return a curried function `fn` that expects the rest of the arguments.
+- If you want to curry a function that accepts a variable number of arguments (a variadic function, e.g. `Math.min()`), you can optionally pass the number of arguments to the second parameter `arity`.
+
+```js
+const curry = (fn, arity = fn.length, ...args) =>
+  arity <= args.length ? fn(...args) : curry.bind(null, fn, arity, ...args);
+```
+
+```js
+curry(Math.pow)(2)(10); // 1024
+curry(Math.min, 3)(10)(50)(2); // 2
+```