Question

Is there a way to declare an argument as “optional” in the Go programming language?

Example of what I mean:

func doSomething(foo string, bar int) bool {
    //...
}

I want the parameter bar to be optional and default to 0 if nothing is passed through.

doSomething("foo")

would be the same as

doSomething("foo",0)

I’m unable to find anything about this matter in the official documentation about functions.

Answer 1

I don’t believe Go does support optional arguments to functions, though you can fake it with variadic functions. The C approach, if you don’t want to do that, is to pretend the language supports currying:

func doSomethingNormally(foo string) bool {
    doSomething(foo, 0)
}