Ruby Programming Examples

creating array

ruby

#!/usr/bin/ruby

names = Array.new(20)
puts names.size  # This returns 20
puts names.length # This also returns 20

string builtin method

ruby

#!/usr/bin/ruby

myStr = String.new("THIS IS TEST")
foo = myStr.downcase

puts "#{foo}"

expression substitution

ruby

#!/usr/bin/ruby

x, y, z = 12, 36, 72
puts "The value of x is #{ x }."
puts "The sum of x and y is #{ x + y }."
puts "The average was #{ (x + y + z)/3 }."

begin end statement

ruby

#!/usr/bin/ruby

BEGIN { 
   # BEGIN block code 
   puts "BEGIN code block"
} 

END { 
   # END block code 
   puts "END code block"
}
   # MAIN block code 
puts "MAIN code block"

block and method example

ruby

#!/usr/bin/ruby

def test(&block)
   block.call
end
test { puts "Hello World!"}

block and method

ruby

#!/usr/bin/ruby

def test
   yield
end
test{ puts "Hello world"}

yield parameter

ruby

#!/usr/bin/ruby

def test
   yield 5
   puts "You are in the method test"
   yield 100
end
test {|i| puts "You are in the block #{i}"}

yield statement

ruby

#!/usr/bin/ruby

def test
   puts "You are in the method"
   yield
   puts "You are again back to the method"
   yield
end
test {puts "You are in the block"}

variable number

ruby

#!/usr/bin/ruby

def sample (*test)
   puts "The number of parameters is #{test.length}"
   for i in 0...test.length
      puts "The parameters are #{test[i]}"
   end
end
sample "Zara", "6", "F"
sample "Mac", "36", "M", "MCA"

ruby return statement

ruby

#!/usr/bin/ruby

def test
   i = 100
   j = 200
   k = 300
return i, j, k
end
var = test
puts var

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