hasownproperty javascript w3schools code example
Example 1: javascript hasownproperty
var person = {
"first_name": "Bob",
"last_name": "Dylan"
};
person.hasOwnProperty('first_name');
person.hasOwnProperty('age');
Example 2: hasownproperty javascript
var x = {
y: 10};
console.log(x.hasOwnProperty("y"));
console.log(x.hasOwnProperty("z"));
Example 3: how reliable is js hasownproperty
o = new Object();
o.propOne = null;
o.hasOwnProperty('propOne');
o.propTwo = undefined;
o.hasOwnProperty('propTwo');