Ruby way to define binary

ruby-talk
1

hi2all

I have some trouble. How can i define the binary of value in ruby? (I
have a value, and I want to know that's it true or false).

The simplest (but not good in my opinion) way is to do it:

v = value.to_s
return v == "false" | v == "true"

What method I can use? I can't find something helpful in core.

Thanks, Michael

···

--
Posted via http://www.ruby-forum.com/.

2

I have some trouble. How can i define the binary of value in ruby?
(I have a value, and I want to know that's it true or false).

Use match

ruby-1.9.2-p290 :001 > value = "road"
=> "road"
ruby-1.9.2-p290 :002 > if value.match('road')
ruby-1.9.2-p290 :003?> puts "true"
ruby-1.9.2-p290 :004?> else
ruby-1.9.2-p290 :005 > puts "false"
ruby-1.9.2-p290 :006?> end
true
=> nil
ruby-1.9.2-p290 :007 >

Wayne

3

not sure I understand your question correctly, but Ruby does not offer
boolean data type as in many other programming languages. However,
there are "true" and "false" objects which you can use for that
purpose:
v = true # or v = false
if v then
  puts "v is true"
else
  puts "v is false"
end

···

On Wed, Dec 7, 2011 at 4:05 AM, Misha Ognev <b1368810@lhsdv.com> wrote:

hi2all

I have some trouble. How can i define the binary of value in ruby? (I
have a value, and I want to know that's it true or false).

The simplest (but not good in my opinion) way is to do it:

v = value.to_s
return v == "false" | v == "true"

What method I can use? I can't find something helpful in core.

Thanks, Michael

--
Posted via http://www.ruby-forum.com/.

4

I myself patched class String and added a .to_bool method that turns
"false" into false and "true" into true.

···

--
Posted via http://www.ruby-forum.com/.

5

You don't really need to. Everything in ruby has a "truthiness" to it and can be used in logical expressions. Only nil and false are "falsey" and everything else are "truthy". In other words, just use objects and they'll take care of you.

if var then
  do_something
end

If you feel REALLY insecure about typing in a dynamic language you can always double-negate:

class Object
  def truthy?
    !!self
  end
end

if var.truthy? then # wasted cycles for no gain
  do_something
end

···

On Dec 6, 2011, at 12:05 , Misha Ognev wrote:

hi2all

I have some trouble. How can i define the binary of value in ruby? (I
have a value, and I want to know that's it true or false).

6

not sure I understand your question correctly, but Ruby does not offer
boolean data type as in many other programming languages.

I want to hear this :wink: Thanks!

I myself patched class String and added a .to_bool method that turns
"false" into false and "true" into true.

Why ruby core team don't want to add it to ruby lang?

Cheers, Michael

···

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Posted via http://www.ruby-forum.com/.

7

Why would you ever need to represent a false as the string 'false'?

k

···

On 07.12.11 09:56, Marc Heiler wrote:

I myself patched class String and added a .to_bool method that turns
"false" into false and "true" into true.