1obj = { name: 'Bobo' } //key: value
2obj.newName = obj.name // on object create new key name. Assign old value to this
3delete obj.name //delete object with old key name

1function renameProperty(obj, oldName, newName) {
2  obj[newName] = obj[oldName];
3  delete obj[oldName];
4}

1obj.newProperty = obj.property
2delete obj.property

1a.Prop3 = a.Prop1;
2delete a.Prop1;
3