Angular - Advanced Patterns
Which syntax correctly registers multiple providers using the multi-provider pattern in Angular?
Which syntax correctly registers multiple providers using the multi-provider pattern in Angular?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct multi-provider syntax
To register multiple providers under one token, each provider must havemulti: trueset.Step 2: Check options for correct usage
Only providers: [{ provide: TOKEN, useClass: ServiceA, multi: true }, { provide: TOKEN, useClass: ServiceB, multi: true }] setsmulti: truefor both providers. providers: [{ provide: TOKEN, useClass: ServiceA }, { provide: TOKEN, useClass: ServiceB }] missesmulti, options withmulti: falseor invalid strings like'yes'do not work.Final Answer:
providers: [{ provide: TOKEN, useClass: ServiceA, multi: true }, { provide: TOKEN, useClass: ServiceB, multi: true }] -> Option BQuick Check:
multi: true enables multi-provider registration [OK]
Quick Trick: Always set multi: true for multi-provider registration [OK]
Common Mistakes:
- Omitting multi: true causes only last provider to register
- Setting multi: false disables multi-provider behavior
- Using string instead of boolean for multi
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