Method proposition

ruby-talk
1

hi all,
what do you think of these methods:

class TrueClass
  def switch
    false
  end
end

class FalseClass
  def switch
    true
  end
end

i think i could find some real use for this, though switch! would probably
be even more useful..
greetings, Dirk.

2

Hi --

···

On Sun, 22 Jan 2006, Dirk Meijer wrote:

hi all,
what do you think of these methods:

class TrueClass
def switch
   false
end
end

class FalseClass
def switch
   true
end
end

i think i could find some real use for this, though switch! would probably
be even more useful..

You don't like "not"? :slight_smile:

What would switch! do?

David

--
David A. Black
dblack@wobblini.net

"Ruby for Rails", from Manning Publications, coming April 2006!

3

hi,

You don't like "not"? :slight_smile:

hmm.. guess i missed that :wink:

What would switch! do?

switch! would change self

greetings, Dirk.

4

hi again,

foobar=true
foobar=not(foobar)
doesn't seem to work, while i can see purpose in that,

light_switch=false
light_switch.switch if dark==true

5

True would become False. False would become True... Human sacrifice,
dogs and cats living together - mass hysteria!

···

On 1/21/06, dblack@wobblini.net <dblack@wobblini.net> wrote:

Hi --

On Sun, 22 Jan 2006, Dirk Meijer wrote:

> hi all,
> what do you think of these methods:
>
> class TrueClass
> def switch
> false
> end
> end
>
> class FalseClass
> def switch
> true
> end
> end
>
> i think i could find some real use for this, though switch! would probably
> be even more useful..

You don't like "not"? :slight_smile:

What would switch! do?

6

Hi --

···

On Sun, 22 Jan 2006, Dirk Meijer wrote:

hi,

You don't like "not"? :slight_smile:

hmm.. guess i missed that :wink:

What would switch! do?

switch! would change self

So:

   true.switch!
   1 == 1 # false

?

David

--
David A. Black
dblack@wobblini.net

"Ruby for Rails", from Manning Publications, coming April 2006!

7

er, the global value 'true' is the only instance of TrueClass. so,
doing true.switch! would make true become false?

So then,
if 1 == 1
  puts "hi"
end

Wouldn't print anything?

(I wouldn't want to maintain your programs :slight_smile:

···

On 1/21/06, Dirk Meijer <hawkman.gelooft@gmail.com> wrote:

hi,

> You don't like "not"? :slight_smile:

hmm.. guess i missed that :wink:

> What would switch! do?

switch! would change self

8

Hi --

···

On Sun, 22 Jan 2006, Dirk Meijer wrote:

hi again,

foobar=true
foobar=not(foobar)
doesn't seem to work, while i can see purpose in that,

You would do:

x = (not x)

or

x = !x

David

--
David A. Black
dblack@wobblini.net

"Ruby for Rails", from Manning Publications, coming April 2006!

9

er, the global value 'true' is the only instance of TrueClass. so,
doing true.switch! would make true become false?

So then,
if 1 == 1
puts "hi"
end

Wouldn't print anything?

that, on second thought, probably wouldn't work, and the following would
have to be used:

light_switch=false
light_switch=light_switch.switch if dark==true

10

dblack@wobblini.net writes:

You would do:

x = (not x)

Is it just me, or does the precedence of "not" horribly suck? :wink:

···

David

--
Christian Neukirchen <chneukirchen@gmail.com> http://chneukirchen.org

11

I think here is where a Symbol would be most fitting :wink:

  light_switch = :off
  light_switch = :on if dark?
  
E

···

On 2006.01.22 04:31, Dirk Meijer wrote:

> er, the global value 'true' is the only instance of TrueClass. so,
> doing true.switch! would make true become false?
>
> So then,
> if 1 == 1
> puts "hi"
> end
>
> Wouldn't print anything?

that, on second thought, probably wouldn't work, and the following would
have to be used:

light_switch=false
light_switch=light_switch.switch if dark==true

12

I'd just like to point out that this now makes it 4 Ruby programmers needed to change a lightbulb (or at least turn it on) so far in this thread. Would anybody like to take a guess at how many it would have taken in other languages?

···

On 21 Jan 2006, at 19:42, Eero Saynatkari wrote:

I think here is where a Symbol would be most fitting :wink:

  light_switch = :off
  light_switch = :on if dark?

--
Paul Robinson

13

Eero Saynatkari wrote:

er, the global value 'true' is the only instance of TrueClass. so,
doing true.switch! would make true become false?

So then,
if 1 == 1
puts "hi"
end

Wouldn't print anything?

that, on second thought, probably wouldn't work, and the following would
have to be used:

light_switch=false
light_switch=light_switch.switch if dark==true

I think here is where a Symbol would be most fitting :wink:

  light_switch = :off
  light_switch = :on if dark?

I don't get it...

light_switch = dark

should be the same as

light_switch=false
light_switch=light_switch.switch if dark==true

right? (and *please* don't compare to 'true' if something is true, it *is* already true, comparing it with true doesn't change that - never)

also

light_switch = !light_switch

should 'switch' the switch, right?

puzzled, or did i missed the joke?

Simon

···

On 2006.01.22 04:31, Dirk Meijer wrote: