Star in case statements

[Hal E. Fulton]

I just noticed something that I either didn't know
or just forgot. :)

You can use the *array notation to specify values
for the when clause in a case statement:

list1 = [1,2,6,8,9]
list2 = [3,4,5,7,10]
case item
when *list1
puts "in list 1"
when *list2
puts "in list 2"
end

Cool, eh?

Hal

--
Hal Fulton
[email]hal9000@hypermetrics.com[/email]

[Martin DeMello]

Hal E. Fulton <hal9000@hypermetrics.com> wrote:

> I just noticed something that I either didn't know
> or just forgot. :)
>
> You can use the *array notation to specify values
> for the when clause in a case statement:

Very neat! I was gratified when I first discovered you could splat a
range too (as in a = *(1..10)).

martin

[Martin DeMello]

Dave Brown <dagbrown@lart.ca> wrote:

>
> This is weird though:
>
> irb(main):001:0> *(1..10)
> SyntaxError: compile error
> (irb):1: syntax error
> from (irb):1
> irb(main):002:0> a=*(1..10)
> => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
> irb(main):003:0>
>
> I wonder why that does that.

*(1..10) doesn't expand to [1,2,3,4,5,6,7,8,9,10], it expands to
1,2,3,4,5,6,7,8,9,10. a = 1,2,3,4,5,6,7,8,9,10 does the right thing (see
the multiple assignment section of the pickaxe book). [*(1..10)] works
too.

martin