# JavaScript How to sum properties of two objects in javascript properties object javascript,object properties javascript loop,object properties javascript

You can create a function for this. A function that should accept the two points should be enough, then in the implementation create a new Point that contains the sum of each property.

``````function addPoint(pointA, pointB) {
const newX = pointA.x + pointB.x;
const newY = pointA.y + pointB.y;
return new Point(newX, newY);
}
``````

This is the most basic code you can do for it, but for instance there are other approaches such as allowing multiple parameters then generating the sum for all of it would require a different approach as well.

``````function sumOfObjects(Obj1, Obj2){
var finalObj = {};
this.keys(Obj1).forEach(value =>{
if (Obj2.hasOwnProperty(value)) {
finalObj[value] = Obj1[value] + Obj2[value]
}
});
return finalObj;
}
``````

You can do something like below code. We are adding a static method on Point function which will add two objects and return new object.

``````function Point(x, y) {
this.x = x;
this.y = y;
}

const x = a.x + b.x;
const y = a.y + b.y;
return new Point(x, y)
}

a = new Point(1,2);
b = new Point(2,3);

console.log('a: ', a)
console.log('b: ', b)
console.log('c: ', c)``````

So, it turns out that is possible to do it. It just isn't advisable to do it.

I found the solution after some more digging in an old post: Fake operator overloading in JavaScript article and git Fake operator overloading for JavaScript code

credit to Axel Rauschmayer, the author

``````function Point(x, y) {
if (arguments.length === 0) {
x = 0;
y = 0;
} else if (arguments.length !== 2) {
throw new Error("Need either 0 or 2 arguments");
}
this.x = x;
this.y = y;
}

Point.operands = [];

Point.prototype.valueOf = function() {
Point.operands.push(this);
// Lowest natural number x where the following are all different:
// x + x, x - x, x * x, x / x
return 3;
}
Object.defineProperty(Point.prototype, "_", {
set: function(value) {
var ops = Point.operands;
var operator;
if (ops.length >= 2 && (value === 3 * ops.length)) {
} else {
throw new Error("Unsupported operation (code " + value + ")");
}
Point.operands = []; // reset
return operator.apply(this, ops);
},
get: function() {
return this.toString();
}
});

//-------------- Operator implementations
this.x = first.x;
this.y = first.y;
[].slice.call(arguments, 1).forEach(function(op) {
this.x += op.x;
this.y += op.y;
}, this);
return this;
}

//-------------- Various helpers
Point.prototype.toString = function() {
return "Point(" + this.x + ", " + this.y + ")";
}
Point.prototype.equals = function(other) {
return this.x === other.x && this.y === other.y;
}

//-------------- Testing it
var p = new Point();
var a = new Point(1, 2);
var b = new Point(4, 3);

p._ = a + b;
console.log(p); // Point {x: 5, y: 5}``````

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