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javascript/snippets/uncurry.md

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+---
+title: Uncurry function
+type: snippet
+tags: [function]
+cover: perfect-timing
+dateModified: 2020-10-22T20:24:44+03:00
+---
+
+Uncurries a function up to depth `n`.
+
+- Return a variadic function.
+- Use `Array.prototype.reduce()` on the provided arguments to call each subsequent curry level of the function.
+- If the `length` of the provided arguments is less than `n` throw an error.
+- Otherwise, call `fn` with the proper amount of arguments, using `Array.prototype.slice()`.
+- Omit the second argument, `n`, to uncurry up to depth `1`.
+
+```js
+const uncurry = (fn, n = 1) => (...args) => {
+  const next = acc => args => args.reduce((x, y) => x(y), acc);
+  if (n > args.length) throw new RangeError('Arguments too few!');
+  return next(fn)(args.slice(0, n));
+};
+```
+
+```js
+const add = x => y => z => x + y + z;
+const uncurriedAdd = uncurry(add, 3);
+uncurriedAdd(1, 2, 3); // 6
+```