You want to add logging features to an Angular app without changing existing services. How can the multi-provider pattern help?

hard📝 Application Q15 of 15

Angular - Advanced Patterns

ARegister multiple logging services under one token with multi: true, then inject all to run logs

BReplace existing services with new ones using the same token without multi: true

CCreate a new module that imports all services separately

DUse multi-provider pattern to inject only the first registered service

Step-by-Step Solution

Solution:

Step 1: Understand the goal
You want to add logging features without changing existing services, so you need to add providers without replacing them.
Step 2: Apply multi-provider pattern
Register multiple logging services under one token with multi: true. Angular injects all as an array, allowing combined logging without modifying existing code.
Final Answer:
Register multiple logging services under one token with multi: true, then inject all to run logs -> Option A
Quick Check:
Multi-provider adds features by injecting arrays of providers [OK]

Quick Trick: Use multi: true to add features without replacing services [OK]

Common Mistakes:

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