Pawan Nogariya Pawan Nogariya - 5 months ago 11
Javascript Question

Javascript : How to add getter to an existing object

I can have getter in javascript object like this

var member = {
firstName:"XYZ",
lastName:"zzz",
get fullName(){ return (this.firstName + ' ' + this.lastName); }
}


And I can even add more properties on the fly like this

member.isGuest = true;


But is there any way we can add getters to already existing object? Something like this

member.isGuest = get isGuest(){ return this.firstName=='Guest';}

Answer

try defineProperty

Object.defineProperty(member, 'isGuest', {
  get: function() { return this.firstName=='Guest' }
});
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