how reliable is js hasownproperty

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1var person = {	
2  	"first_name": "Bob",
3	"last_name": "Dylan"
4};
5person.hasOwnProperty('first_name'); //returns true
6person.hasOwnProperty('age'); //returns false

1o = new Object();
2o.propOne = null;
3o.hasOwnProperty('propOne');   // returns true
4o.propTwo = undefined;  
5o.hasOwnProperty('propTwo');   // returns true
6

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