"ruby cheat sheet" Code Answer's

ruby cheat sheet

By DevLorenzo on Jan 04, 2021

Four good ruby cheat Sheets:
https://overapi.com/ruby
http://www.testingeducation.org/conference/wtst3_pettichord9.pdf
https://github.com/ThibaultJanBeyer/cheatsheets/blob/master/Ruby-Cheatsheet.md#basics
https://www.vikingcodeschool.com/professional-development-with-ruby/ruby-cheat-sheet

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best ruby cheat sheet

By DevLorenz02 on Jan 04, 2021

def greeting(hello, *names) # *name is a splat argument, takes several parameters passed in an array
  return "#{hello}, #{names}"
end

start = greeting("Hi", "Justin", "Maria", "Herbert") # call a method by name

def name(variable=default)
  ### The last line in here get's returned by default
end

Source: github.com

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best ruby cheat sheet

By DevLorenz02 on Jan 04, 2021

"Hello".length # 5
"Hello".reverse # “olleH”
"Hello".upcase # “HELLO”
"Hello".downcase # “hello”
"hello".capitalize # “Hello”
"Hello".include? "i" # equals to false because there is no i in Hello
"Hello".gsub!(/e/, "o") # Hollo
"1".to_i # transform string to integer –– 1
"test".to_sym # converts to :test
"test".intern # :test
:test.to_s # converts to "test"

Source: github.com

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best ruby cheat sheet

By DevLorenz02 on Jan 04, 2021

my_array = [a,b,c,d,e]
my_array[1] # b
my_array[2..-1] # c , d , e
multi_d = [[0,1],[0,1]]
[1, 2, 3] << 4 # [1, 2, 3, 4] same as [1, 2, 3].push(4)

Source: github.com

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best ruby cheat sheet

By DevLorenz02 on Jan 04, 2021

unless false # unless checks if the statement is false (opposite to if).
puts “I’m here”
else
puts “not here”
end
# or
puts "not printed" unless true

Source: github.com

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best ruby cheat sheet

By DevLorenz02 on Jan 04, 2021

i = 0
until i == 6
  puts i
  i += 1
end

Source: github.com

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