[Solved] Given this Angular provider setup:providers: [ { provide: 'TOKEN', useValue: 'A', multi: true }, { provide: 'TOKEN', useValue: 'B', multi:... | Angular

Angular - Advanced Patterns

Given this Angular provider setup:

providers: [
  { provide: 'TOKEN', useValue: 'A', multi: true },
  { provide: 'TOKEN', useValue: 'B', multi: true }
]

What will Angular inject when you ask for inject('TOKEN')?

AAn array ['A', 'B']

BThe string 'B'

CAn array ['B', 'A']

DAn error because of duplicate tokens

Step-by-Step Solution

Solution:

Step 1: Understand multi-provider injection behavior
When multiple providers use the same token with multi: true, Angular injects an array of all values in registration order.
Step 2: Analyze given providers
Providers register 'A' first, then 'B'. So injection returns ['A', 'B'].
Final Answer:
An array ['A', 'B'] -> Option A
Quick Check:
Multi-provider injects array of all registered values [OK]

Quick Trick: Multi-provider injects array in registration order [OK]

Common Mistakes:

Master "Advanced Patterns" in Angular

9 interactive learning modes - each teaches the same concept differently

More Angular Quizzes

Given this Angular provider setup: