[Solved] Which is the correct way to inject a service into an Angular component constructor? - Ans: constructor(private myService: MyService) {} | Angular

Angular - Services and Dependency Injection

Which is the correct way to inject a service into an Angular component constructor?

Aconstructor() { this.myService = MyService; }

Bconstructor(myService = new MyService()) {}

Cconstructor(public myService) {}

Dconstructor(private myService: MyService) {}

Step-by-Step Solution

Solution:

Step 1: Recall Angular dependency injection syntax
Angular injects services by declaring them as private/public in the constructor parameters.
Step 2: Check each option
constructor(private myService: MyService) {} uses correct syntax with private and type annotation. Others create instances manually or miss type.
Final Answer:
constructor(private myService: MyService) {} -> Option D
Quick Check:
Use private with type in constructor = D [OK]

Quick Trick: Use private and type in constructor for services [OK]

Common Mistakes:

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Which is the correct way to inject a service into an Angular component constructor?