Difference between Constructor and ngOnInit in Angular 18

Understanding Component Initialization in Angular

In Angular development, understanding the difference between Constructor and ngOnInit is crucial for effective component management. These two methods play distinct roles in the component lifecycle, and knowing when and how to use each can significantly improve your application's performance and structure.

Constructor: Dependency Injection and Basic Initialization

The Constructor is primarily used for dependency injection and basic variable initialization. It runs before Angular sets up data binding and is the ideal place to inject services and perform minimal setup tasks. However, it's recommended to keep the Constructor light and avoid complex logic.

ngOnInit: Advanced Component Initialization

ngOnInit is called after Angular has fully initialized a component's data-bound properties. This method is perfect for:

• Initializing component data that depends on input properties
• Making HTTP requests
• Performing complex initialization logic

Watch the full video tutorial here for a comprehensive explanation with practical examples.

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