Ruby redo and retry Statement
In Ruby, Redo statement is used to repeat the current iteration of the loop. redo always used inside the loop. The redo statement restarts the loop without evaluating the condition again.
# Ruby program of using redo statement #!/usr/bin/ruby restart = false # Using for loop for x in 2..20 if x == 15 if restart == false # Printing values puts "Re-doing when x = " + x.to_s restart = true # Using Redo Statement redo end end puts x end |
Output:
2 3 4 5 6 7 8 9 10 11 12 13 14 Re-doing when x = 15 15 16 17 18 19 20
In above example, redo statement apply when x = 15.
retry Statement:
To repeat the whole loop iteration from the start the retry statement is used. retry always used inside the loop.
Example #1:
# Ruby program of retry statement # Using do loop 10.times do |i| begin puts "Iteration #{i}" raise if i > 2 rescue # Using retry retry endend |
Output:
Iteration 0 Iteration 1 Iteration 2 Iteration 3 Iteration 3 Iteration 3 ...
Example #2:
# Ruby program of retry statement def Beginner attempt_again = true p 'checking' begin # This is the point where the control flow jumps p 'crash' raise 'foo' rescue Exception => e if attempt_again attempt_again = false # Using retry retry end endend |