Default block arguments for Ruby 1.8.7
When your block takes an argument that should have an default, only in Ruby 1.9 you can say:
block = lambda do |message, options = {}|
# ...
end
If you are on Ruby 1.8.6 or 1.8.7 you must resort to the following workaround:
block = lambda do |*args|
message = args[0]
options = args[1] || {}
end
Related cards:
Missing certificates for rubygems and bundler in Ruby 1.8.7
Using Ruby 1.8.7 you will not be able to use the maximum versions Rubygems 1.8.30 and Bundler 1.17.3 with https://rubygems.org/ anymore. This is a result of a server certificate on December 5th, 2020. The resulting errors will...
Installing RubyGems for Ruby 1.8.6
Since version 1.5 RubyGems requires at least Ruby 1.8.7. The last one working with Ruby 1.8.6 was RubyGems 1.4.2.
You get still download it from their servers and [install RubyGems]...
Using the Ruby block shortcut with arguments
Ruby has this handy block shortcut map(&:to_i) for map { |x| x.to_i }. However, it is limited to argument-less method invocations.
To call a method with an argument, you usually need to use the full block form. A common and annoying case is r...
Ruby 1.9 or Ruby 2.0 do not allow using shortcut blocks for private methods
Consider this class:
class Foo
private
def test
puts "Hello"
end
end
While you can say create a block to call that method (using ampersand and colon) on Ruby 1.8, ...
1.8.7 > Foo.new.tap(&:te...
How to fix "undefined method `name' for Array" error when running bundled commands on Ruby 1.8.7 + Rails 2.3
On recent/fresh installations of Ruby 1.8.7 you may encounter this error why calling any bundled binary (or just bundle exec):
/home/arne/.rvm/gems/ruby-1.8.7-p374@global/gems/rubygems-bundler-1.4.2/lib/rubygems-bundler/noexec.rb:75:in ...
Remove resource fork files from a FAT volume on MacOS
Be careful!
The following solution will delete files on a volume. If you don't know exactly what you're doing, you can run into big trouble with your computer.
I play mp3 files on my car stereo that are stored on a SD-C...
Ruby: A small summary of what return, break and next means for blocks
Summary
- Use
returnto return from a method.returnaccepts a value that will be the return value of the method call. - Use
breakto quit from a block and from the method that yielded to the block.breakaccepts a value that suppl...
Objective-C for Rubyists | PeepCode Screencasts for Web Developers and Alpha Geeks
If you know Ruby and you want to write applications for Mac OS X or the iPhone, you’re in a great place to start! This concise and content-packed 80-minute screencast will teach you what you need to know to start programming in Objective-C.
Ruby blocks: Braces and do/end have different precedence
TL;DR {} binds stronger than do … end (as always in Ruby, special characters bind stronger than words)
Demo
Right way
names = ['bRUce', 'STaN', 'JOlIE']
# Blocks in braces are passed to the rightmost method
print names.m...
How to build the perfect number of blank records for a nested form
When you render a nested form for a Movie which has_many :actors, you want to render the right number of blank Actor forms. The right number means:
- A minimum number of blank forms so the user can add more
Actorsto an existingMovie, ...