More Ruby, less Rails: Rediscover the beauty of Ruby

I cover the basic Ruby features and unfamiliar topics, such as Ruby refinements. Be prepared for some eye-opening insights from the Ruby documentation!

Transcript

1. MORE Ruby, less Rails Let’s rediscover Ruby together
2. MORE Ruby, less Rails Let’s rediscover Ruby together https://maikhel.github.io Michał Łęcicki
3. before we start…
4. 🎓
5. 🤷
7. MORE Ruby, less Rails Let’s rediscover Ruby together
8. Ruby Gems
9. Package of Ruby code that provides a speci fi c functionality. Ruby Gems
10. Stdlib Default Gems
 Bundled Gems Native Extensions Independent Gems Ruby Gems
11. 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
12. Default gems Installed with Ruby Can’t be removed Maintained by Ruby core benchmark
 did_you_mean irb singleton prettyprint
13. Bundled gems Installed with Ruby Can be removed or updated Maintained outside of Ruby core abbrev csv minitest
 prime rake
14. Native extensions Require compilation on install Platform dependent pg
 nokogiri mysql2
15. Stdlib Default Gems
 Bundled Gems Native Extensions Independent Gems Ruby Gems
16. Quiz
17. json Default gem ✅
18. test-unit Bundled gem ✅
19. securerandom Default gem ✅
20. minitest Bundled gem ✅
21. rspec A great gem 🌟
22. https://alchemists.io/articles/ruby_default_gems https://stdgems.org/ https://docs.ruby-lang.org/en/3.4/standard_library_md.html
23. Ruby Heredocs
27. Ruby heredoc
28. Ruby heredoc
33. Squiggly heredoc << ~ ✨
34. Closing tag must not be indented! unless…
35. << - ✨
36. 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/
37. Ruby Refinements
40. Monkey patching 🐒
41. Sub class 👪
42. Ruby Refinement 💎
43. Ruby Refinement 💎
44. 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
45. Ruby Refinements 💎 https://alchemists.io/articles/ruby_re fi nements https://github.com/bkuhlmann/re fi nements
46. Variables
47. Local Instance
 Class
 Constants Global Variables
49. $! - 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
50. $= - 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
53. Ensure
57. Reserved keywords
58. Words that are part of the language syntax.
 You cannot use them as variable, method or class/module names. Reserved keywords
59. Quiz
60. using Not a keyword ❌
61. BEGIN Reserved keyword ✅
62. Not a keyword ❌ exit
63. private Not a keyword ❌
64. self Reserved keyword ✅
65. try Doesn’t exist in Ruby!
66. Random stuff
67. Enumerable#tally
68. Enumerable#tally
69. Enumerable#tally
70. Enumerable#all?
71. Enumerable#none?
72. Enumerable#any? There is also Enumerable#one?
73. Enumerable#chunk
74. Enumerable#each_slice
75. Enumerable#each_slice
76. Enumerable#slice_before
77. Enumerable#slice_after
78. Enumerable#slice_when
79. Enumerable#zip
80. Enumerable#zip
81. Enumerable#zip
82. Lazy enumerator Ruby operators precedence File IO#open modes Ruby exception classes
83. before we fi nish…
84. https://www.visuality.pl/posts/how-to-become-a-ruby-certified-programmer
85. https://github.com/ruby-association/prep-test/blob/master/silver.md
86. https://maikhel.github.io/about#presentations Thank you!