JavaScript Object Properties

In JavaScript, object properties define the structure and data stored in an object. Each property is a key-value pair, where the key identifies the property and the value holds the associated data.

Understanding Object Properties

A property has two parts:

• Key: A string or symbol used as the property name
• Value: The data associated with that key

Types of Property Keys

• String (default): "name", "age"
• Symbol: A unique identifier

Accessing Properties

Dot Notation:

Bracket Notation:

Useful for dynamic or complex keys:

Adding and Updating Properties

Deleting Properties

Property Existence Check

Looping Through Properties

Object.defineProperty()

Use this method to define a property with fine-grained control:

Computed Property Names

Create dynamic property keys:

Property Shorthand (ES6)

When the variable name and property name match:

Key Takeaways

• Object properties store data as key-value pairs.
• Use dot or bracket notation to access or modify values.
• Check existence using in or hasOwnProperty().
• Use Object.defineProperty() for advanced control.
• ES6 provides shorthand and computed property name features for cleaner code.