JavaScript Object hasOwnProperty() Method

JavaScript Property Accessors Method

Last Updated : 23 Apr, 2021

Property Accessors allow access with the property name or keys of an object (Reading, Creating, Updating).

There are two notations in JavaScript that allows us to access object’s properties:

Dot Notation
Bracket Notation [ ]

If the object does not find a matching key(or property name or method name), the property accessors return undefined.

Dot Notation

The property must have a valid JavaScript identifier in the object.property syntax. (The property names are technical ‘IdentifyingNames’ as part of ECMAScript standards, not ‘Identifiers,’ so that words reserved are used but not recommended).

object_name.property_name;

Example :

Javascript

<script> 
  const obj = { 
   g: 'geeks', 
   fg: 'forgeeks'
  }; 
  console.log(obj.g) 
</script>

Output :

geeks

Bracket Notation

An expression is a valid code unit that resolves/assesses to a value. The resolution value is then typecasted into a string, which is considered as the propertyName.

Note: Any property_name that is a keyword cannot be accessed, as it is going to give you an Unexpected Token Error.

object_name[expression];

Example :

Javascript

const obj = { 
 g: 'geeks', 
 fg: 'forgeeks'
}; 
console.log(obj['fg'])

Output :

forgeeks

JavaScript Object hasOwnProperty() Method

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