Ruby while Loop

The Ruby while loop is used to iterate a program several times. If the number of iterations is not fixed for a program, while loop is used.

Ruby while loop executes a condition while a condition is true. Once the condition becomes false, while loop stops its execution.

Syntax:

while conditional [do]
   code
end

Example:

#!/usr/bin/ruby 
x = gets.chomp.to_i 
while x >= 0	 
  puts x 
  x -=1 
end 

Output:

Ruby do while Loop

The Ruby do while loop iterates a part of program several times. It is quite similar to a while loop with the only difference that loop will execute at least once. It is due to the fact that in do while loop, condition is written at the end of the code.

Syntax:

loop do 
  #code to be executed
  break if booleanExpression
end 

Example:

loop do 
  puts "Checking for answer" 
  answer = gets.chomp 
  if answer != '5' 
    break 
  end 
end

Output:

Next TopicRuby until loop

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