Immutable Object

[RCN]

Often we have to define new objects.


var obj = { ExtNet: "Object.Net", ExtJS: "Sencha" };


It's possible to define new properties and update existing ones


obj.Gtx = "Sencha";
obj.ExtNet = "Updated";

Result:


{
"ExtNet": "Updated",
"ExtJS": "Sencha",
"Gtx": "Sencha"
}


But it may be required to define a immutable object. It's possible to do that by using Object.freeze.


var obj = Object.freeze({ ExtNet: "Object.Net", ExtJS: "Sencha" });


Hope it helps.