“add” function that works with different combinations of chaining/arguments

Question

I\'m trying to write an add function that will work in many scenarios.

add(2,2,2) //6
add(2,2,2,2) //8
add(2)(2)(2) // 6
add(2)(2)(2,2).value() //8
add(2,2)(         


        

Answer 1

Since you are returning the sum in the ret.add function thats why the error is coming try something like this, hope it will solve your problem

function add(){
    var sum = 0;
    for( var i in arguments ){
        sum += arguments[i];
    }

    var ret = add.bind(null, sum);

    ret.value = function () {
      return sum;
    }

    ret.add = function () {
      for( var i in arguments ){
        sum += arguments[i];
      }
      return ret;
    }

    ret.valueOf = function(){ return sum; };

    return ret;
}