ArrVsObj

var a=[{id:1,val:1},{id:2,val:2},{id:3,val:3},{id:4,val:4},{id:5,val:5},{id:6,val:6},{id:7,val:7},{id:8,val:8},{id:9,val:9},{id:10,val:10}]

a.find(i=>i.id==1).val;
a.find(i=>i.id==2).val;
a.find(i=>i.id==3).val;
a.find(i=>i.id==4).val;
a.find(i=>i.id==5).val;
a.find(i=>i.id==6).val;
a.find(i=>i.id==7).val;
a.find(i=>i.id==8).val;

var a={"1":1,"2":2,"3":3,"4":4,"5":5,"6":6,"7":7,"8":8,"9":9,"10":10};

a["1"];
a["2"];
a["3"];
a["4"];
a["5"];
a["6"];
a["7"];
a["8"];