hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'
end
((i.e, whatever value is included in the array))
...how do i do this?
tia
--
Posted via http://www.ruby-forum.com/.
Shai Rosenfeld wrote:
hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'end
((i.e, whatever value is included in the array))
...how do i do this?
Does the Array#include? method do what you need? Perhaps a more fleshed-out example might help?
--
Alex
hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'end
((i.e, whatever value is included in the array))
...how do i do this?
Strange problem you have here... What if array includes all: 1,11,15?
What the result should be?
choices = {1 => 'this is what i want', 11 => 'not result', 15 => 'no good'}
data = [1, 2, 3, 4]
data.inject(){|result, k| result << choices[k]}.compact
=> ["this is what i want"]
Regards,
Rimantas
You can do it with the other form of "case":
a = [1,2,3,4]
result = case
when a.include?(1): 'this is what i want'
when a.include?(11): 'not result'
when a.include?(15): 'no good'
end
Kind regards
robert
2007/8/8, Shai Rosenfeld <shaiguitar@gmail.com>:
hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'end
((i.e, whatever value is included in the array))
...how do i do this?
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?
Array#include is EXACTLY what i need, but syntaxtetically (if u get the
drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end
(the above doesn't work. it's gives a 'not enough arguments' error. how
do i do it correctly?)
--
Posted via http://www.ruby-forum.com/\.
Robert Klemme wrote:
hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'end
((i.e, whatever value is included in the array))
...how do i do this?You can do it with the other form of "case":
a = [1,2,3,4]
result = case
when a.include?(1): 'this is what i want'
when a.include?(11): 'not result'
when a.include?(15): 'no good'
end
Or the other way around:
a = [1,2,3,4]
b = 2
result = case b
when *a: "yes!"
else "no!"
end
2007/8/8, Shai Rosenfeld <shaiguitar@gmail.com>:
--
Alex
a = [1,2,3,4]
result = case
when a.include?(1): 'this is what i want'
when a.include?(11): 'not result'
when a.include?(15): 'no good'
end
ahhhhhhhhhhhhhhhh
perfect.
thanks.
--
Posted via http://www.ruby-forum.com/\.
include? takes an argument x, and is called on a collection n, so that
if n.include?(x) it returns true.
http://www.whytheluckystiff.net/ruby/pickaxe/html/ref_c_array.html#Array.include_qm
On Aug 8, 10:05 am, Shai Rosenfeld <shaigui...@gmail.com> wrote:
Alex Young wrote:
> Shai Rosenfeld wrote:
>> end>> ((i.e, whatever value is included in the array))
>> ...how do i do this?> Does the Array#include? method do what you need? Perhaps a more
> fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the
drift) i'm not sure how to do it:case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end(the above doesn't work. it's gives a 'not enough arguments' error. how
do i do it correctly?)
--
Posted viahttp://www.ruby-forum.com/.
You could possibly do something like the following, but it's pretty dangerous:
class Object
alias_method :old_case_equal, :===
def ===(other)
case other
when Array:
other.include? self
else
old_case_equal(other)
end
end
end
puts case [3, 45, 6, 'abc']
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end
I.e. case calls === on each when condition, so if you define proper
=== that will not break other things, you're done.
when you run
case a
when b: ...
when c: ...
end
ruby will evaulate
b === a, i.e. b.===(a)
c === a, i.e. c.===(a)
J.
On 8/8/07, Shai Rosenfeld <shaiguitar@gmail.com> wrote:
Alex Young wrote:
> Shai Rosenfeld wrote:
>> end
>>
>> ((i.e, whatever value is included in the array))
>> ...how do i do this?
>
> Does the Array#include? method do what you need? Perhaps a more
> fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the
drift) i'm not sure how to do it:case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end(the above doesn't work. it's gives a 'not enough arguments' error. how
do i do it correctly?)
Shai Rosenfeld wrote:
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end
I'm not sure why you're using case here. I'd do it like this:
[3, 45, 6, 'abc'].include?(var) ? "good" : "no good"
--
Alex
Shai Rosenfeld wrote:
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end(the above doesn't work. it's gives a 'not enough arguments' error. how do i do it correctly?)
Here's is a little trick that works
class Casey
def initialize(o)
@o = o
end
def method_missing(name)
CaseyMethod.new(@o, name)
end
end
class CaseyMethod
def initialize(o, m)
@o = o
@m = m
end
def ==(other)
@o.send(@m, other)
end
end
class Object
def casey
Casey.new(self)
end
end
case [2,3,4].casey.include?
when 1
puts "a"
when 2
puts "b"
else
puts "c"
end
--
Brad Phelan
http://xtargets.com
Hi --
On Thu, 9 Aug 2007, Alex Young wrote:
Robert Klemme wrote:
2007/8/8, Shai Rosenfeld <shaiguitar@gmail.com>:
hi guys,
was wondering the syntax of how to do this:
case [1,2,3,4]
when 1: 'this is what i want'
when 11: 'not result'
when 15: 'no good'end
((i.e, whatever value is included in the array))
...how do i do this?You can do it with the other form of "case":
a = [1,2,3,4]
result = case
when a.include?(1): 'this is what i want'
when a.include?(11): 'not result'
when a.include?(15): 'no good'
endOr the other way around:
a = [1,2,3,4]
b = 2
result = case b
when *a: "yes!"
else "no!"
end
I had the impression that Shai wanted to check both for the inclusion
of one item, and the absence of others. I'm not sure, since the
original example was kind of pseudo-code based on what he wanted and
it wasn't clear what should happen in a fall-through situation (which
I know case doesn't do, but I think Shai was angling for that).
David
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)
Hi --
On Thu, 9 Aug 2007, Shai Rosenfeld wrote:
a = [1,2,3,4]
result = case
when a.include?(1): 'this is what i want'
when a.include?(11): 'not result'
when a.include?(15): 'no good'
endahhhhhhhhhhhhhhhh
perfect.
I'm curious about the fall-through case. If the array does not
include 1, 11, or 15, then result will be nil, which I assume is
equivalent to a "no good" result. That makes me wonder whether a
simple include? would work equally well. Or is there more to the
various error conditions?
David
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)
Kaldrenon wrote:
Array#include is EXACTLY what i need, but syntaxtetically (if u get the
--
Posted viahttp://www.ruby-forum.com/.include? takes an argument x, and is called on a collection n, so that
if n.include?(x) it returns true.http://www.whytheluckystiff.net/ruby/pickaxe/html/ref_c_array.html#Array.include_qm
please read the post before posting yourself.
what i need is the syntax of a case statement doing the following:
case [a, b, c, d]
when x: 'nothing happens'
when y: 'nothing happens'
when z: 'nothing happens'
when a: 'render this option'
end
can anyone help me with a live code example of how to do this?
many thanks.
On Aug 8, 10:05 am, Shai Rosenfeld <shaigui...@gmail.com> wrote:
--
Posted via http://www.ruby-forum.com/\.
Hi --
Shai Rosenfeld wrote:
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
endI'm not sure why you're using case here. I'd do it like this:
[3, 45, 6, 'abc'].include?(var) ? "good" : "no good"
I think the problem is that if it includes both 1 and 3, it's no good.
You (Shai) could do something like:
module YesNo
def yes_no(a,b)
[*a].all? {|e| include?(a) } and not [*b].any? {|e| include?(e) }
end
end
a = [1,2,3,4,5]
a.extend(YesNo)
p a.yes_no(3,6) # true
p a.yes_no(3,5) # false
(Those two lines are my only tests at the moment so try it out some
more 
David
On Wed, 8 Aug 2007, Alex Young wrote:
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)
Brad Phelan wrote:
Shai Rosenfeld wrote:
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end(the above doesn't work. it's gives a 'not enough arguments' error. how do i do it correctly?)
Here's is a little trick that works
class Casey
def initialize(o)
@o = o
end
def method_missing(name)
CaseyMethod.new(@o, name)
end
endclass CaseyMethod
def initialize(o, m)
@o = o
@m = m
end
def ==(other)
@o.send(@m, other)
end
endclass Object
def casey
Casey.new(self)
end
endcase [2,3,4].casey.include?
when 1
puts "a"
when 2
puts "b"
else
puts "c"
end--
Brad Phelan
http://xtargets.com
The problem with the above is that I don't think it does what you want. It breaks out after it finds the first match and doesn't try to match
any further. If more than one *when* expression matches only the
first block is executed.
--
Brad Phelan
http://xtargets.com
Hi --
On Wed, 8 Aug 2007, Jano Svitok wrote:
On 8/8/07, Shai Rosenfeld <shaiguitar@gmail.com> wrote:
Alex Young wrote:
Shai Rosenfeld wrote:
end
((i.e, whatever value is included in the array))
...how do i do this?Does the Array#include? method do what you need? Perhaps a more
fleshed-out example might help?Array#include is EXACTLY what i need, but syntaxtetically (if u get the
drift) i'm not sure how to do it:case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
end(the above doesn't work. it's gives a 'not enough arguments' error. how
do i do it correctly?)You could possibly do something like the following, but it's pretty dangerous:
class Object
alias_method :old_case_equal, :===def ===(other)
case other
when Array:
other.include? self
else
old_case_equal(other)
end
end
end
Let's go back to the "pretty dangerous" thing I think this is
beyond the acceptable danger threshold; you're actually making it so
that Array#=== won't work any more, which could really make things
blow up.
David
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)
Alex Young wrote:
Shai Rosenfeld wrote:
drift) i'm not sure how to do it:
case [3, 45, 6, 'abc'].inlcude?
when 1: 'no good'
when 3: 'good!'
when 'lolo': 'no good'
endI'm not sure why you're using case here. I'd do it like this:
[3, 45, 6, 'abc'].include?(var) ? "good" : "no good"
...went for this in the end. i suppose the case statement w/ array
include opt didn't really fit the needs, all in all. thanks all for your
answers though.
David, what is this all? method? is it a Array#method ? i didn't find it
in the docs..?
[*a].all? {|e| include?(a) } and not [*b].any? {|e| include?(e) }
--
Posted via http://www.ruby-forum.com/\.
Shai Rosenfeld wrote:
what is this all? method? is it a Array#method ? i didn't find it
in the docs..?
It's Enumerable#all?. It returns true if the block evaluates to true for all
elements (or in case there is no block, if all the elements are true (i.e.
non-nil/false)
HTH,
Sebastian
--
NP: Explosions in the Sky - First Breath After Coma
Jabber: sepp2k@jabber.org
ICQ: 205544826
Hi --
On Wed, 8 Aug 2007, Shai Rosenfeld wrote:
David, what is this all? method? is it a Array#method ? i didn't find it
in the docs..?[*a].all? {|e| include?(a) } and not [*b].any? {|e| include?(e) }
It's a method of Enumerable.
David
--
* Books:
RAILS ROUTING (new! http://www.awprofessional.com/title/0321509242\)
RUBY FOR RAILS (http://www.manning.com/black\)
* Ruby/Rails training
& consulting: Ruby Power and Light, LLC (http://www.rubypal.com)