29 lines
879 B
Markdown
29 lines
879 B
Markdown
---
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title: uncurry
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tags: function,advanced
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firstSeen: 2018-02-14T11:56:44+02:00
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lastUpdated: 2020-10-22T20:24:44+03:00
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---
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Uncurries a function up to depth `n`.
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- Return a variadic function.
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- Use `Array.prototype.reduce()` on the provided arguments to call each subsequent curry level of the function.
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- If the `length` of the provided arguments is less than `n` throw an error.
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- Otherwise, call `fn` with the proper amount of arguments, using `Array.prototype.slice()`.
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- Omit the second argument, `n`, to uncurry up to depth `1`.
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```js
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const uncurry = (fn, n = 1) => (...args) => {
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const next = acc => args => args.reduce((x, y) => x(y), acc);
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if (n > args.length) throw new RangeError('Arguments too few!');
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return next(fn)(args.slice(0, n));
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};
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```
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```js
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const add = x => y => z => x + y + z;
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const uncurriedAdd = uncurry(add, 3);
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uncurriedAdd(1, 2, 3); // 6
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```
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