30 currify a function

curry.js

var curry = (f) => {
  var argc = f.length
  var _curry = (fn) => {
    return (...args) => {
      if (args.length == argc) {
        return fn(...args)
      } else {
        return fn.bind(null, ...args)
      }
    }
  }

  for (var i = 0; i < argc - 1; i++) {
    f = _curry(f)
  }
  return f
}

// test
var arith = (a, b, c, d, e) => a + b - c * d / e
var carith = curry(arith)

console.log(carith(1)(2)(3)(4)(5))
console.log(carith(1, 2)(3)(4)(5))
console.log(carith(1, 2, 3)(4)(5))
console.log(carith(1)(2, 3)(4, 5))
console.log(carith(1, 2, 3)(4, 5))
console.log(carith(1, 2, 3, 4, 5))