Ruby/Statement/while

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Another form you can use is with begin/end

temp = 98.3
begin
  print "Your temperature is " + temp.to_s + " Fahrenheit. "
  puts "I think you"re okay."
  temp += 0.1
end while temp < 98.6
puts "Your temperature is " + temp.to_s + " Fahrenheit. Are you okay?"



Here"s the formal specification for the while loop:

while condition [ do | : ]
  code
end



loop code based on the result of a comparison made on each loop

x = 1
while x < 100
  puts x
  x = x * 2
end



Replace one array with another

#!/usr/bin/env ruby
i = 0
breeds = [ "quarter", "arabian", "appalosa", "paint" ]
puts breeds.size # => 4
temp = []
while i < breeds.size do
  temp << breeds[i].capitalize
  i += 1
end
temp.sort! # => ["Appalosa", "Arabian", "Paint", "Quarter"]
breeds.replace( temp )
p breeds # => ["Appalosa", "Arabian", "Paint", "Quarter"]



The while Loop

i = 0
breeds = [ "q", "ar", "ap", "p" ]
puts breeds.size # => 4
temp = []
while i < breeds.size do
  temp << breeds[i].capitalize
  i +=1
end
temp.sort!
breeds.replace( temp )
p breeds



The while loop executes its contained code while a condition that you specify remains true.

while($_ != "q")
  puts "Running..."
  print "Enter q to quit: "
  gets
  chomp
end



use while loop to convert elements in an array to capitalized case

#!/usr/bin/env ruby
i = 0
breeds = [ "quarter", "arabian", "appalosa", "paint" ]
puts breeds.size # => 4
temp = []
while i < breeds.size do
  temp << breeds[i].capitalize
  i += 1
end
temp.sort! # => ["Appalosa", "Arabian", "Paint", "Quarter"]
breeds.replace( temp )
p breeds # => ["Appalosa", "Arabian", "Paint", "Quarter"]



While loop with array length

a = [1, "test", 2, 3, 4]
i = 0
while (i < a.length)
  puts a[i].to_s + "X"
  i += 1
end
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/Statement/while»