Using "if 3 in list_foo" for Python for Ruby

Ruby
1

There is no such thing as

if 3 in [3, 2, 1]

construct in Ruby? so the common way in Ruby is

if list1.include?(3)

or

if list1.index(3)

is that right? is there an idiom in Ruby to do something like

if 3.in([3,2,1])

or

if 3.in [3,2,1]

2

Hi –

On Sun, 23 Sep 2007, SpringFlowers AutumnMoon wrote:

if list1.index(3)

is that right? is there an idiom in Ruby to do something like

if 3.in([3,2,1])

or

if 3.in [3,2,1]

The include? way is the usual way. Hal F. at one point proposed an
in or in? method that would essentially be:

class Object
def in?(collection)
collection.include?(self)
end
end

but I don’t think it’s on the radar for being added.

David

3

David A. Black wrote:

On Sun, 23 Sep 2007, SpringFlowers AutumnMoon wrote:

if 3.in [3,2,1]

The include? way is the usual way. Hal F. at one point proposed an
in or in? method that would essentially be:

class Object
def in?(collection)
collection.include?(self)
end
end

but I don’t think it’s on the radar for being added.

Hm… wouldn’t that be handy…

i just sort of think that, if you ask me, “have you been to [Hawaii,
China, France]”, i probably should be able to look at each one and tell
you an answer of yes or no, instead of asking [Hawaii, China, France] to
tell whether they have seen me.