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Best practice for implementing helper functions in Swift: Static vs. Singleton vs. Instance Method?

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Hey everyone,

I’m currently grappling with coding fundamentals, particularly what I would refer to as 'helper classes.'

For instance, when I need a function that makes an API call and returns some data, I would create a class called APIService to house that function, fetchData(args) -> 'data.'

  1. Should I define APIService as a class or a struct?
  2. How should I implement fetchData:
    • Should I define fetchData as a static function in APIService and call it with APIService.fetchdata?
    • Should I make APIService a Singleton and call APIService.shared.fetchdata?
    • Should I define it as a 'normal' method of APIService, and when calling it, create a new instance of APIService and call it like newAPIService.fetchdata?

It would be greatly appreciated if someone could help me sort this out.

Thanks a lot! Harry

   

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