Difference between different modes of Dependency injection in Angular 4

Question

constructor(srv: SomeService)

constructor(private srv: SomeService)

constructor(public srv: SomeService)

What is the difference between these DI's and which one should I prefer?

Günter Zöchbauer · Accepted Answer · 2017-04-24 20:18:00Z

6

That's not related to Angular DI, that's only related to TS class constructors.

The later 2 implicitly create a class field named srv while the first does not. In the first example srv will only be available within the constructor body.

answered Apr 24, 2017 at 20:18

Günter Zöchbauer

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2 Comments

Wayne Over a year ago

So, is there any difference between the last two (private vs public for the injected srv)?

Günter Zöchbauer Over a year ago

No. When one of these is present, then a field with the same name will be created and the value automatically assigned to it.

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