Ruby Quicktips
Random Ruby and Rails tips.
This blog is dedicated to deliver short, interesting and practical tidbits of the Ruby language and Ruby on Rails framework. Read more...
Your submissions are more than welcome!
This blog is dedicated to deliver short, interesting and practical tidbits of the Ruby language and Ruby on Rails framework. Read more...
Your submissions are more than welcome!
May 9 ’10
★
Convert anything to boolean
Just add !! (a.k.a. the double bang operator) before any statement:
>> @document = Document.new
=> <Document id: nil, title: nil>
>> @document.title
=> nil
>> !!@document.title
=> false
>> @document.title = "My new document"
>> !!@document.title
=> true
In Rails, you can use the name of your attribute followed by a question mark:
>> @document.title?
=> true
>> @document.title = nil
>> @document.title?
=> false
If you want to read more about this, I recommend the following blogposts and their comments:
This tip was submitted by Vladimir Rybas.
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