Go Functional Options Pattern FAQs

Question 1

How does this pattern maintain backward compatibility?

Accepted Answer

Because the constructor uses a variadic slice of options, you can add new 'With*' functions over time without changing the function signature of the constructor, meaning existing code never breaks.

Question 2

When should I use Functional Options over a Config Struct?

Accepted Answer

Use Functional Options for public APIs with 3 or more optional parameters or when you expect the API to grow. Config Structs are better suited for simple, internal APIs where options rarely change.

Question 3

Why use an interface instead of a closure for options?

Accepted Answer

The interface approach is preferred because it allows options to be compared in tests, facilitates easier debugging through the Stringer interface, and allows for more complex logic than simple closures.

Question 4

Can this pattern handle required parameters?

Accepted Answer

Absolutely. Idiomatic Go practice suggests passing required parameters as standard arguments first, followed by the variadic slice of optional functional options.

Question 5

Does this skill follow the Uber Go Style Guide?

Accepted Answer

Yes, the implementation patterns are specifically distilled from the Uber Style Guide and Google's internal Go coding standards for production software.

Go Functional Options Pattern

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