More Ruby, less Rails: Rediscover the beauty of Ruby

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MORE Ruby, less Rails Let’s rediscover Ruby together

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MORE Ruby, less Rails Let’s rediscover Ruby together https://maikhel.github.io Michał Łęcicki

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before we start…

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🎓

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🤷

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MORE Ruby, less Rails Let’s rediscover Ruby together

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Ruby Gems

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Package of Ruby code that provides a speci fi c functionality. Ruby Gems

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Stdlib Default Gems  Bundled Gems Native Extensions Independent Gems Ruby Gems

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Stdlib Math  Object Socket MakeMake fi le Gem Installed with Ruby Not packed as a separate .gem files Can’t be updated independently of Ruby

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Default gems Installed with Ruby Can’t be removed Maintained by Ruby core benchmark  did_you_mean irb singleton prettyprint

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Bundled gems Installed with Ruby Can be removed or updated Maintained outside of Ruby core abbrev csv minitest  prime rake

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Native extensions Require compilation on install Platform dependent pg  nokogiri mysql2

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Stdlib Default Gems  Bundled Gems Native Extensions Independent Gems Ruby Gems

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Quiz

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json Default gem ✅

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test-unit Bundled gem ✅

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securerandom Default gem ✅

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minitest Bundled gem ✅

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rspec A great gem 🌟

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https://alchemists.io/articles/ruby_default_gems https://stdgems.org/ https://docs.ruby-lang.org/en/3.4/standard_library_md.html

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Ruby Heredocs

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Ruby heredoc

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Ruby heredoc

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Squiggly heredoc << ~ ✨

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Closing tag must not be indented! unless…

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<< - ✨

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Ruby Heredocs Starting tag and closing tag must match String interpolation turned on by default <<~ strips indendation << - strips indendation of closing tag https://blog.saeloun.com/2020/04/08/heredoc-in-ruby-and-rails/

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Ruby Refinements

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Monkey patching 🐒

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Sub class 👪

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Ruby Refinement 💎

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Ruby Refinement 💎

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Ruby Refinements 💎 You can refine class methods ( refine Date.singleton_class ) You can’t refine constants, nor class variables Monkey Patching a refinement will void the refinement

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Ruby Refinements 💎 https://alchemists.io/articles/ruby_re fi nements https://github.com/bkuhlmann/re fi nements

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Variables

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Local Instance  Class  Constants Global Variables

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$! - latest error message $@ - location of error $_ - string last read by `gets` $. - line number last read by interpreter $& - string last matched by regexp $~ - the last regexp match, as an array of subexpressions $1, $2, ..., $n - the nth subexpression in the last match (same as $~[n]) Special Variables

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$= - case-insensitivity fl ag $/ - input record separator $\ - output record separator $0 - the name of the Ruby script fi le $* - the command line arguments $$ - interpreter's process ID $? - exit status of last executed child process Special Variables

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Ensure

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Reserved keywords

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Words that are part of the language syntax.  You cannot use them as variable, method or class/module names. Reserved keywords

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Quiz

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using Not a keyword ❌

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BEGIN Reserved keyword ✅

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Not a keyword ❌ exit

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private Not a keyword ❌

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self Reserved keyword ✅

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try Doesn’t exist in Ruby!

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Random stuff

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Enumerable#tally

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Enumerable#tally

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Enumerable#tally

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Enumerable#all?

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Enumerable#none?

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Enumerable#any? There is also Enumerable#one?

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Enumerable#chunk

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Enumerable#each_slice

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Enumerable#each_slice

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Enumerable#slice_before

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Enumerable#slice_after

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Enumerable#slice_when

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Enumerable#zip

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Enumerable#zip

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Enumerable#zip

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Lazy enumerator Ruby operators precedence File IO#open modes Ruby exception classes