Iota with string constants

[m...@inanc.io]

Is it anything wrong just assigning string values to get rid of String() method attaching?

Like this:

type Weekday string

const (
  Sunday Weekday = "Sunday"
  Monday Weekday = "Monday"
)

func main() {
  fmt.Println(Sunday)
}

Instead of this:

type weekday uint

const (

  Sunday weekday = iota

  Monday

)

var weekdayNames = [...]string{"Sunday", "Monday"}

func (day weekday) String() string {

  return weekdayNames[day]

}


func main() {
  fmt.Println(Sunday)
}

Thanks.

[Marvin Stenger]

You could also use this:
https://godoc.org/golang.org/x/tools/cmd/stringer

[Inanc Gumus]

Yep, I know that one, I’m asking about the convention, idioms and the performance-wise.

Inanc Gumus

Marvin Stenger <marvin.s...@gmail.com> şunları yazdı (16 Eki 2017 02:45):

You could also use this:
https://godoc.org/golang.org/x/tools/cmd/stringer

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[Diego Medina]

If it is something like weekdays (very few options), I don't see any issues with it. Stringer is great when as you go along using your app, you may need to add more values over time.

using iota and stringer is great when your list may be 15 or more items, and keeping them updated becomes a chore you would like to avoid.

Regards,

Diego

[Inanc Gumus]

Thx. Btw, I don't know about any inlining help from the Go compiler when you use iota or a string inside constants. 

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[Josh Humphries]

Comparing values will be a lot cheaper with ints than strings. So if your enum type is possibly used in hot loops, ints will be your friend. Also, with ints, you can provide an ordering that differs from the lexical order of the string values. For example, with an int, you can easily sort by day-of-week by defining the constants in order. With strings, you have to use a custom compare function that acts on string names (ick).

----
Josh Humphries
jh...@bluegosling.com

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