Ruby Cheatsheet

Ruby Cheatsheet

Ruby For Dummies
Ruby Cheatsheet Pdf
Ruby Cheat Sheet
Ruby, Go cheat sheet. Idiom ID Imports Comments Links Only entries having Ruby Only entries having Go The snippets are under the CC-BY-SA license. Consider printing in landscape mode; or not printing at all, and keeping a bookmark. Ruby cheatsheet This is a cheatsheet for Ruby beginners and contains links to resources and some simple examples to get started with Ruby. 0 Comments for this cheatsheet. Devhints.io / Over 352 curated cheatsheets, by developers for developers. Devhints home Other Ruby libraries cheatsheets. Factory Bot cheatsheet Meta-tags gem cheatsheet Ronn cheatsheet Slim cheatsheet Chunky PNG.

PDF Link: cheatsheet-ruby-A4.pdf, Category: languages
Blog URL: https://cheatsheet.dennyzhang.com/cheatsheet-ruby-A4
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1.1 SummaryNameComment
Check syntaxruby -c my.rb
Generate random keyr = Random.new, r.rand(10..42)
Install ruby 2.4GitHub: Ubuntu install ruby 2.4
Install package with specific versiongem install rubocop -v '0.44.1'
Install package with a range of versionsgem install rails -v '~>4.0.0'
Install package with a range of versionsgem install rails -v '>3.1, <4.1'
Get RubyGem envgem env
Check whether variable is nilif value.nil?
Run system commandsystem('commandhere')
Run bash commandstdin, stdout, stderr = Open3.popen3('ls .')
1.2 ListNameComment
Check existence[‘Cat', ‘Dog', ‘Bird'].include? ‘Dog'
Find iteml1.find_index(x)
Remove item from listl1.delete_at(2)
Remove duplicate entries[1,2,2,1,4,4,5,6,7,8,5,6].uniq
Deep copy a listl1=l.dup
1.3 StringNameComment
Substringstring[1.3]
Search substring'option=name=bob'.index('name')
Replace'Welcome to PHP Essentials!'.gsub('PHP', 'Ruby')
Remove trailing comma'ab;123;'.chomp(';')
Strip whitespacehost = host.strip()

Name	Comment
Check syntax	`ruby -c my.rb`
Generate random key	`r = Random.new, r.rand(10..42)`
Install ruby 2.4	GitHub: Ubuntu install ruby 2.4
Install package with specific version	`gem install rubocop -v '0.44.1'`
Install package with a range of versions	`gem install rails -v '~>4.0.0'`
Install package with a range of versions	`gem install rails -v '>3.1, <4.1'`
Get RubyGem env	`gem env`
Check whether variable is nil	`if value.nil?`
Run system command	`system('commandhere')`
Run bash command	`stdin, stdout, stderr = Open3.popen3('ls .')`

Name	Comment
Check existence	[‘Cat', ‘Dog', ‘Bird'].include? ‘Dog'
Find item	`l1.find_index(x)`
Remove item from list	`l1.delete_at(2)`
Remove duplicate entries	`[1,2,2,1,4,4,5,6,7,8,5,6].uniq`
Deep copy a list	`l1=l.dup`

Name	Comment
Substring	`string[1.3]`
Search substring	'option=name=bob'.index('name')
Replace	'Welcome to PHP Essentials!'.gsub('PHP', 'Ruby')
Remove trailing comma	'ab;123;'.chomp(';')
Strip whitespace	`host = host.strip()`

Ruby For Dummies

1.4 Integer
1.5 ConversionNameComment
Convert string to int'14'.toi, '1,112'.delete(‘,').toi
Round float to 2 digits(5.65235534).round(2)
Format datetimeputs time.strftime('%Y-%m-%d %H:%M:%S')
1.6 Dict & Set

Name	Comment
Convert string to int	'14'.to_i, '1,112'.delete(‘,').to_i
Round float to 2 digits	`(5.65235534).round(2)`
Format datetime	`puts time.strftime('%Y-%m-%d %H:%M:%S')`

Ruby For Dummies1.4 Integer
1.5 ConversionNameComment
Convert string to int'14'.toi, '1,112'.delete(‘,').toi
Round float to 2 digits(5.65235534).round(2)
Format datetimeputs time.strftime('%Y-%m-%d %H:%M:%S')
1.6 Dict & Set
1.7 FileNameComment
Check whether directory existFile.directory?('xxx')
Check whether files existFile.file?('hello.rb')
Read file to stringcontents = File.read('filename')
Write to file
1.8 Code SnippetsGet ip from eth0
Get hostname
Ruby Cheatsheet PdfGet hostname from ip
Ruby Cheat Sheet1.9 More Resources

Name	Comment
Check whether directory exist	`File.directory?('xxx')`
Check whether files exist	`File.file?('hello.rb')`
Read file to string	`contents = File.read('filename')`