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What is the difference between a constructor and ngOnInit() in Angular

What is the difference between a constructor and ngOnInit() in Angular

Pranam Bhat

Pranam Bhat

What is the difference between a constructor and ngOnInit() in Angular. How they called and explain the flow in detail.

2 Replies

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Ganesan C5y ago
Accepted answer
- The constructor() should only be used to initialize class members. So we should use constructor() to set up Dependency Injection, Initialization of class fields, etc.
- ngOnInit() is a better place to write “actual work code” that we need to execute as soon as the class is instantiated
- Constructor() --> ngOnChanges() --> ngOnInit()
+1
Ronika Jency5y ago
Hi,
```
export class AppName implements OnInit {
constructor() {
// Called first time before the ngOnInit()
}
ngOnInit() {
// Called after the constructor and called after the first ngOnChanges()
}
}
```
Please refer below link,

https://www.c-sharpcorner.com/interview-question/what-is-the-difference-between-quotconstructorquot-and-quotngoninitquot-in-angular
+1