Dependency Injection with Go

Re:Dependency Injection with Go by mutatio on Monday July 28, 2014 @04:40AM (#8095733)

I was referring to Go's magic func init()

Putting that in your files, let's say:

  db.go func init() => handle global DB's...

  templates.go func init() => handle HTML templates...

  settings.go func init() => load some settings...

All fired automatically prior to your applications main() entry point WITHOUT needing to pollute main() with initDB(); initTemplates(); initSettings() etc. etc.

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Re:Dependency Injection with Go by nostrademons on Monday July 28, 2014 @05:22AM (#8095825)

They're trying to pass the objects created at startup into other objects, so that dependencies are explicit and can be mocked out in unit tests. You can't do this with init(), which always takes no arguments and returns no values.

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Re:Dependency Injection with Go by sagichmal on Monday July 28, 2014 @03:58PM (#8098988)

    > I was referring to Go's magic func init()

I know you were; I'm arguing that components shouldn't need an explicit initialization step, but rather they should be initialized as part of their `NewFoo` constructor.

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