Addition of two or more functions in javascript

Question

I have a function which gives three objects

function myfunc(one, two, three){
    this.one = one;
    this.two = two;
    this.three = three;
}

var a = new myfunc(6,5,7);
var b = new myfunc(10,4,2);
var c = new mufunc(20,1,8);

This gives the three separate objects which are useful. However, i want to create a forth object which is the sum of a,b and c. In effect this would be the same as:

var all = new myfunc(36, 10, 17);

I can do this manually:

aa = a.one + b.one + c.one
bb = a.two + b.two + c.two
cc = a.three + b.three + c.three

var all = new myfunc(aa, bb, cc)

but is there a better way which is less manual.

No, there is no other way since each object knows nothing about the others. — BenM
– BenM, Commented Jul 22, 2019 at 10:42
Is it possible to add the the three variables together in one equation / function? — ben121
– ben121, Commented Jul 22, 2019 at 10:43

Bergi · Accepted Answer · 2019-07-22 10:49:26Z

3

You could put them into an array and sum their properties in a loop of course:

var list = [a, b, c];
function sum(arr, prop) {
    return arr.reduce((acc, x) => acc+x[prop], 0);
}
var all = new myfunc(sum(list, "one"), sum(list, "two"), sum(list, "three"));

Alternatively, mutate an initially empty instance in a loop:

var all = [a, b, c].reduce((obj, x) => {
    obj.one += x.one;
    obj.two += x.two;
    obj.three += x.three;
    return obj;
}, new myfunc(0, 0, 0));

edited Jul 22, 2019 at 10:49

answered Jul 22, 2019 at 10:46

Bergi

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1 Comment

BenM Over a year ago

Very nice solution!

BenM · Accepted Answer · 2019-07-22 10:50:25Z

1

The only way to achieve this is to create a function to handle this for you, if you're going to be running it regularly. Just pass in the objects and the function will handle it:

function sum_objects( obj1, obj2, obj3 )
{
  return new myfunc(
    (obj1.one + obj2.one + obj3.one),
    (obj1.two + obj2.two + obj3.two),
    (obj1.three + obj2.three + obj3.three)
  );
}

edited Jul 22, 2019 at 10:50

answered Jul 22, 2019 at 10:48

BenM

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Comments

E_net4 · Accepted Answer · 2019-07-22 10:54:19Z

-2

function myfunc(one, two, three){
    this.one = one;
    this.two = two;
    this.three = three;
}

myfunc.prototype.add = function(){
    return this.one + this.two + this.three
}

var all = new myfunc(36, 10, 17);
all.add()

edited Jul 22, 2019 at 10:54

E_net4

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answered Jul 22, 2019 at 10:52

Arun Gupta

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2 Comments

BenM Over a year ago

That adds the properties of the same object together, not the same property of three objects together.

BenM Over a year ago

Furthermore, that returns a number, not another myfunc object.

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