[SOLVED] sum(2)(3) and sum(2, 3) what is the common solution for both

sum(2)(3) and sum(2, 3) what is the common solution for both

I was asked this question in an interview.

for sum(2)(3) in currying style

sum(a) {
  return (b) {
    return a + b;
  }
}

for sum (2, 3)

sum(a, b) {
  return a + b;
}

Is there any common function which can work for both

Solution

Here's a function that can create a generalized curried function from any non-curried function. It is written without using any ECMAScript 6 syntax. This works regardless of the number of parameters expected by the original function, or the number of arguments provided to each partial application.

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

function product (a, b, c) {
  return a * b * c;
}

function curry (fn) {
  return function partial () {
    if (arguments.length >= fn.length) {
      return fn.apply(this, arguments);
    }

    var partialArgs = Array.prototype.slice.call(arguments);
    var bindArgs = [this].concat(partialArgs);
    return partial.bind.apply(partial, bindArgs);
  };
}

var s = curry(sum);

console.log(s(1, 2));
console.log(s(1)(2));
console.log(s()()(1)()()(2));

var p = curry(product);

console.log(p(2, 3, 4));
console.log(p(2)(3)(4));
console.log(p()()(2)()()(3, 4));