Ian's answer addresses your question about the absence of a slice.Contains
method, but there have been discussions in the past about adding such a
feature to the language itself as well. You brought up the idea of a
builtin "contains" function, and I've seen others suggest adding something
like Python's "in" operator as well. To most of these proposals, the answer
has been "no" because of concerns about hiding a potentially very expensive
operation behind a builtin or operator. There's no doubt that:
return myObj in mySlice
... is easier to miss than:
for _, obj := range mySlice {
if obj == myObj {
return true
}
}
return false
On Tue, Nov 5, 2019 at 12:30 PM toddsurfs via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> Sorry if this question reveals my newness to Go. I tried searching the
> mailing list but I couldn't find anything in a quick search. It seems like
> many languages include the ability to check if an array, or slice contain a
> particular value. I understand that you could do this easily with a for
> loop or alternatively use a map instead. However, is there a reason why Go
> doesn't just have slice.Contains(interface{}) or maybe a builtin
> contains(mySlice, interface{}) ?
>
> I assume one reason might be because slices could potentially be really
> large? Or maybe the community feels that a simple for loop is so easy that
> it is not necessary? I would love to understand this more.
>
> Thank You!
> -Todd
>
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