Angular - Services and Dependency Injection
Why does Angular create multiple instances of a service when it is provided in both a lazy-loaded module and the root injector?
Why does Angular create multiple instances of a service when it is provided in both a lazy-loaded module and the root injector?
hard🧠 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Angular injector hierarchy
Lazy-loaded modules have their own injectors separate from the root injector.Step 2: Explain multiple instances creation
Providing service in both root and lazy module creates separate instances in each injector.Final Answer:
Because lazy-loaded modules have their own injector hierarchy separate from root -> Option DQuick Check:
Lazy modules have separate injectors causing multiple instances [OK]
Quick Trick: Lazy modules have separate injectors causing multiple instances [OK]
Common Mistakes:
MISTAKES- Assuming providers merge automatically
- Thinking root injector overrides lazy module providers
- Believing services can't be singleton anywhere
Master "Services and Dependency Injection" in Angular
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