Ruby Try

This gem has two versions of try().

• Vanilla try()
  • RoR vanilla try() and try!(). Nothing new.
• Boolean try?()
  • try() for boolean functions. It is returns false instead of nil, when trying to call something like nil.try(:some_boolean_method?)

irb(main):001:0> require 'ruby-try'
=> true
irb(main):002:0> nil.try(:admin?)
=> nil
irb(main):003:0> nil.try(:nil?)
=> nil                             # does it make sense?
irb(main):004:0> nil.try?(:admin?)
=> false
irb(main):005:0> nil.try?(:nil?)   # IMHO, it makes sense
=> true

Why boolean try?

Imagine, we have something like this:

def admin_in_team?(team)
  if m = team_members.find_by_team_id(team.id)
    m.admin?
  else
    false
  end
end

Of course, it is better to write something like

def admin_in_team?(team)
  team_members.find_by_team_id(team.id).try(:admin?)
end

But there is a TRAP! If find_by_team_id(team.id) returns nil, nil.try(:anything) returns nil. Is it a reason for writing this HUGE if? I don't think so.

First idea is to patch try(). But it is not best idea. Many developers expects vanilla behavior from try(), so that's why a new try?() method appears. It is looks not elegant, but one line is better than 5 with misty logic.

Compatibility

Do not use gem with 1.8

• 2.1.2
• 2.0.0
• 1.9.3
• jruby (1.9 mode)
• rbx-2.2.9

Report bug if gem fails on your machine

Installation

Add this line to your application's Gemfile:

gem 'ruby-try'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ruby-try

Documentation

Please, use specs to explore behavior of this gem. Or refer to RoR documentation.

git clone https://github.com/OrelSokolov/ruby-try
cd ruby-try
bundle
rspec spec/

Contributing

1. Fork it ( https://github.com/OrelSokolov/ruby-try/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request

AUTHORS

• Oleg Orlov
• RoR team

LICENSE

This gem is released under the MIT License.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.