const curring = fn => {
const { length } = fn
const curried = (...args) => {
return (args.length >= length
? fn(...args)
: (...args2) => curried(...args.concat(args2)))
}
return curried
}
const listMerge = (a, b, c) => [a, b, c]
const curried = curring(listMerge)
console.log(curried(1)(2)(3)) // [1, 2, 3]
console.log(curried(1, 2)(3)) // [1, 2, 3]
console.log(curried(1, 2, 3)) // [1, 2, 3]