Optional arguments implementation

optional.go

// Usage:
//
// SomeFn(1, "test", WithArg1("optional 1"), WithArg2(true))
//
package some_pkg

type Option func(*option)

type option struct {
  arg1 string
  arg2 bool
}

func SomeFn(requiredArg1 int, requiredArg2 string, options ...Option) {
  var optionalArgs option
  
  for _, opt := range options {
    opt(&optionalArgs)
  }
  
  // some stuff
}

func WithArg1(arg1 string) Option {
  return func(opt *option) {
    opt.arg1 = arg1
  }
}

func WithArg2(arg2 bool) Option {
  return func(opt *option) {
    opt.arg2 = arg2
  }
}