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Ruby redo and retry Statement

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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
  end
end

                    
Output:
Iteration 0
Iteration 1
Iteration 2
Iteration 3
Iteration 3
Iteration 3
...
Example #2:
# Ruby program of retry statement
def geeks
  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
  end
end

                    


Last Updated : 17 Sep, 2019
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