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

1.	Here's the formal specification for the while loop:
2.	The while Loop
3.	Another form you can use is with begin/end
4.	While loop with array length
5.	loop code based on the result of a comparison made on each loop
6.	use while loop to convert elements in an array to capitalized case
7.	Replace one array with another

The while loop executes its contained code while a condition that you specify remains true. : while « Statement « Ruby