How do I get ruby to print a full backtrace instead of a truncated one?
When I get exceptions, it is often from deep within the call stack. When this happens, more often than not, the actual offending … Read more
ruby
How to generate a random number between a and b in Ruby?
To generate a random number between 3 and 10, for example, I use: rand(8) + 3 Is there a nicer way to do … Read more
When should I use Struct vs. OpenStruct?
In general, what are the advantages and disadvantages of using an OpenStruct as compared to a Struct? What type of general use-cases would … Read more
Understanding the Gemfile.lock file
After running the bundle install command, ‘Gemfile.lock‘ is created in the working directory. What do the directives inside that file mean? For example, … Read more
Ruby class instance variable vs. class variable
I read https://stackoverflow.com/questions/826734/when-do-ruby-instance-variables-get-set but I’m of two minds when to use class instance variables. Class variables are shared by all objects of a … Read more
Can I invoke an instance method on a Ruby module without including it?
Background: I have a module which declares a number of instance methods module UsefulThings def get_file; … def delete_file; … def format_text(x); … … Read more
How to add new item to hash
I’m new to Ruby and don’t know how to add new item to already existing hash. For example, first I construct hash: hash … Read more
Best way to pretty print a hash
I have a large hash with nested arrays and hashes. I would like to simply print it out so it ‘readable’ to the … Read more
Test whether a Ruby class is a subclass of another class
I would like to test whether a class inherits from another class, but there doesn’t seem to exist a method for that. class … Read more
Output array to CSV in Ruby
It’s easy enough to read a CSV file into an array with Ruby but I can’t find any good documentation on how to … Read more