A beautifully expressive hacker language. Mostly used for rails.
puts "Hello, Ruby!"
In descriptors: high-level, object-oriented and interpreted. Ruby occupies a similar market space to Python, with both striving to create a more human-readable language. I’ll update this as I learn more, with my primary resources being Ruby Koans and Codecademy. In code blocks below,
#> indicates text that is printed to the console.
I’m not, really; it seems like a fun language with lots of respected devs. I don’t have time to learn or tinker with this very flexible scripting lang at the moment. At one point in early 2019, I spent a short, intense period binge-learning C++, then Ruby, in order to meet requirements and complete technical interviews at C++/Ruby shops.
ruby -v will print your ruby version. If you have a ‘good’ OS, you should have a version built in. Upgrade if the version is less than 2.
ruby runs ruby programs.
irb starts an interactive ruby prompt.
On Debian, it is best to add
/.gem/ruby/2.3.0/bin to your PATH in
gem: --user-install to your
~/.gemrc. Be careful not to run gem, bundle, etc as root.
Adding this user bin to your PATH makes it easy to use tools like RuboCop (
gem install rubocop) to
rubocop --fix-layout *.rb your ruby files.
number = 18 boolean = true string = "Hello"
puts "String" #Appends a newline print "String"
puts appends a newline after printing the given string.
x = (3 + 3) / 2 #Brackets x = 3 ** 2 #Exponents x = 3 / 3 #Division x = 3 * 3 #Multiplication x = 3 + 3 #Addition x = 3 - 3 #Subtraction x = 3 % 3 #Modulo
The only operation that may be foreign is modulo, which is the remainder of a division. For instance, running
128 / 13 will give 9, and
128 % 13 will give 11. Stepping backwards,
13 * 9 is 117, and adding 11 gives 128.
x = "String length".length puts x #> 13
Methods without arguments (or to be invoked with only default arguments,) can be called without brackets
puts "RoFlMaO".upcase.reverse.downcase #> oamlfor
x = "Ruby is interesting...".reverse puts x #> ...gnitseretni si ybuR
puts "Ruby is interesting...".upcase #> RUBY IS INTERESTING... puts "Ruby is interesting...".downcase #> ruby is interesting...
Comments can be included anywhere, and are formatted as follows:
# Single line. =begin Multi-line. =end
Names are all lowercase and words are separated with
large_number = 7893425089273045 player_name = "Jimothy"
After installing MongoDB and loading http://media.mongodb.org/zips.json into the database, (or another from https://github.com/ozlerhakan/mongodb-json-files,)
Word Count: 490 words
Reading Time: 3 minutes