写一个方法js将数组对象中某个属性值相同的对象合并成一个新对象

function Dog(name,age){
this.name=name;
this.age=age;
};

Dog.prototype.toString=function(){return this.name, age.this};var myDog1=new Dog("旺财",2);var myDog2=new Dog("来福",8);var myDog3=new Dog("小白",7);var myDog4=new Dog("小黄",3);var myDog5=new Dog("小黑",6); var dogArr=[myDog1,myDog2,myDog3,myDog4,myDog5];function oldDog(arr){newDog=[];for(var i=0;i<arr.length; i++){var l=arr[i];if(l.age>=5){newDog.push(l);}}return newDog;};var result=oldDog(dogArr);console.log(result);