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What will happen if you inject a service into a component but forget to add it to the providers array or provideIn root?

medium📝 component behavior Q5 of 15
Angular - Services and Dependency Injection
What will happen if you inject a service into a component but forget to add it to the providers array or provideIn root?
AAngular throws a runtime error about no provider found
BThe component works but service methods do nothing
CAngular automatically provides the service
DThe service is injected but with default values
Step-by-Step Solution
Solution:

  1. Step 1: Understand Angular dependency injection rules

    Services must be provided either in providers array or with providedIn for injection.

  2. Step 2: Consequence of missing provider

    If missing, Angular throws a runtime error saying no provider found for that service.

  3. Final Answer:

    Angular throws a runtime error about no provider found -> Option A

  4. Quick Check:

    Missing provider causes runtime injection error [OK]
Quick Trick: Always provide services to avoid injection errors [OK]
Common Mistakes:
MISTAKES
  • Assuming Angular auto-provides all services
  • Thinking service silently fails without error
  • Confusing missing provider with missing method

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