How to Uninstall RVM? [duplicate]
This question already has answers here: Closed 10 years ago. Possible Duplicate: How to remove rvm (ruby version manager) from my system? How … Read more
ruby
Should Gemfile.lock be included in .gitignore?
I’m sort of new to bundler and the files it generates. I have a copy of a git repo from GitHub that is … Read more
What does map(&:name) mean in Ruby?
I found this code in a RailsCast: def tag_names @tag_names || tags.map(&:name).join(‘ ‘) end What does the (&:name) in map(&:name) mean? 16 s … Read more
How do you add an array to another array in Ruby and not end up with a multi-dimensional result?
I tried: somearray = [“some”, “thing”] anotherarray = [“another”, “thing”] somearray.push(anotherarray.flatten!) I expected [“some”, “thing”, “another”, “thing”] but got [“some”, “thing”, nil] 18 … Read more
Why use Ruby’s attr_accessor, attr_reader and attr_writer?
Ruby has this handy and convenient way to share instance variables by using keys like attr_accessor :var attr_reader :var attr_writer :var Why would … Read more
Ruby: kind_of? vs. instance_of? vs. is_a?
What is the difference? When should I use which? Why are there so many of them? 5 s 5
What’s the difference between equal?, eql?, ===, and ==?
I am trying to understand the difference between these four methods. I know by default that == calls the method equal? which returns … Read more
Checking if a variable is defined?
How can I check whether a variable is defined in Ruby? Is there an isset-type method available? 15 s 15 Use the defined? … Read more
How to sum array of numbers in Ruby?
I have an array of integers. For example: array = [123,321,12389] Is there any nice way to get the sum of them? I … Read more
How to install a gem or update RubyGems if it fails with a permissions error
I’m trying to install a gem using gem install mygem or update RubyGems using gem update –system, and it fails with this error: … Read more