Uncurry a function

JavaScript

// `fn` is a curried function
// `n` is the depth of parameters
const uncurry =
  (fn, n = 1) =>
  (...args) =>
    (
      (acc) => (args) => args.reduce((x, y) => x(y), acc)
    )(fn)(args.slice(0, n))

Examples

const sum = (a) => (b) => (c) => a + b + c
uncurry(sum, 1)(1)(2)(3) // 6
uncurry(sum, 2)(1, 2)(3) // 6
uncurry(sum, 3)(1, 2, 3) // 6