Set undefined javascript property before read

var tr={};
tr.SomeThing='SomeThingElse';
console.log(tr.SomeThing); // SomeThingElse
console.log(tr.Other); // undefined

tr.get=function(what){
    if (tr.hasOwnProperty(what)) return tr[what];
    else return what;
};
tr.get('SomeThing') // SomeThingElse
tr.get('Other') // Other

Is there any way to make tr.Other or tr['Other'] and all other undefined properties of the object to return its name instead undefined?