hasOwnProperty()
ES3+Returns a boolean indicating whether the object has the specified property as its own property.
Syntax
obj.hasOwnProperty(prop)Parameters
prop string The property name to check
Return Value
boolean
true if the object has the property, otherwise false
Examples
JavaScript
const obj = { name: 'John' };
console.log(obj.hasOwnProperty('name'));
console.log(obj.hasOwnProperty('age'));
console.log(obj.hasOwnProperty('toString'));Output:
// true
false
false