Javascript rectangle intersect function

intersects.js

 /**
    * Check if two objects intersect
    * 
    * Objects need to have x,y,width,height properties
    * 
    * @param {object} obj1 - The first object.
    * @param {object} obj2 - The second object.
    * @returns {boolean} true if objects intersect
    */
    function intersects(obj1, obj2) {

        //if obj1 misses paramters return false
        if (!(obj1.hasOwnProperty("x") || obj1.hasOwnProperty("y") || obj1.hasOwnProperty("width") || obj1.hasOwnProperty("height"))) {
            return false
        }

        //if obj1 misses paramters
        if (!(obj2.hasOwnProperty("x") || obj2.hasOwnProperty("y") || obj2.hasOwnProperty("width") || obj2.hasOwnProperty("height"))) {
            return false
        }

        //check outermost points
        let obj1LeftOf2 = obj1.x + obj1.width < obj2.x;
        let obj1RightOf2 = obj1.x > obj2.x + obj2.width;
        let obj1Above2 = obj1.y > obj2.y + obj2.height;
        let obj1Below2 = obj1.y + obj1.height < obj2.y;

        return !( obj1LeftOf2 || obj1RightOf2 || obj1Above2 || obj1Below2 );

    }

Den här koden används för att kolla om två javascriptobjekt korsar varandra.
För att det ska fungera så måste båda objekten ha följande properties: x,y,width,height.

Exempel:

var player = {
    x:10,
    y:100,
    width: 20,
    height: 20
}

var enemy = {
    x:20,
    y:100,
    width: 20,
    height: 20
}

if(intersects(player,enemy)){
    //Det som ska hända
    alert("game over")
}