function curry(func) {
  return function curried(...args) {
    if (args.length >= func.length) {
      return func.apply(this, args)
    } else {
      return function (...args2) {
        return curried.apply(this, args.concat(args2))
      }
    }
  }
}

function sum(a, b, c) {
  return a + b + c
}

const curriedSum = curry(sum)

console.log(sum(1, 2, 3))
console.log(curriedSum(1)(2))
console.log(curriedSum(1))
console.log(curriedSum(1)(2)(3))