Range over custom type

[Craig Wickesser]

I am trying to range over a custom type which is a slice of custom things, an example will help:

type Widget struct {
  Name string
  Price int
}

type Widgets []Widget

func (w *Widgets) Find(name string) Widget {
  for widget := range w {
     if widget.Name == name {
        return widget
     }
  }
  return nil
}

I get an error when trying to build:

cannot range over w (type *Widgets)

thoughts? answers?

[cm...@golang.org]

You can't range over a pointer to a slice, dereference it first e.g. you probably want something like `range *w`.

[Shawn Milochik]

http://play.golang.org/p/6I4ADhpsQn

This modifications works for me.

[Adam Vincze]

you are ranging over a pointer to a slice of pointers

try to dereference 

other than that, you cannot return nil for a value object  it should be *Widget

like so

http://play.golang.org/p/nKAxGaJ0SD

[Craig Wickesser]

Thanks, dereferencing was the issue.