Retry for reattempting in Ruby - Step-by-Step Execution

Concept Flow - Retry for reattempting

Start

↓

Try block

↓

Error?

No→Success, End

Yes↓

Retry count < max?

No→Raise error, End

Yes↓

Retry block

↓

Back to Try block

The code tries to run a block. If an error happens, it checks if retries remain. If yes, it retries; if no, it stops with error.

Execution Sample

Ruby

attempts = 0
begin
  attempts += 1
  raise 'Fail' if attempts < 3
  puts 'Success'
rescue
  retry if attempts < 3
end

This code tries to run a block that fails twice, then succeeds on the third try.

Execution Table

Step	attempts	Action	Error Raised?	Retry Condition	Output
1	1	Raise error because attempts < 3	Yes	attempts < 3 is true
2	2	Raise error again because attempts < 3	Yes	attempts < 3 is true
3	3	No error, print 'Success'	No	N/A	Success
4	-	End of execution	No	N/A	Program ends

💡 No error on third attempt, so retry stops and program ends successfully.

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
attempts	0	1	2	3	3

Key Moments - 2 Insights

Why does the code retry exactly twice before success?

Because the retry condition checks if attempts < 3 (rows 1 and 2 in execution_table), so it retries twice and succeeds on the third try (row 3).

What happens if the retry condition is never true?

The error is raised and the program stops without retrying, as shown by the 'No' branch in the concept_flow after retry count check.

Visual Quiz - 3 Questions

Look at the execution table, what is the value of 'attempts' at step 2?

A 1

B 3

C 2

D 0

💡 Hint

Check the 'attempts' column in the execution_table row with Step 2.

At which step does the program stop retrying and print 'Success'?

A Step 3

B Step 1

C Step 2

D Step 4

💡 Hint

Look at the 'Output' column in execution_table where 'Success' is printed.

If the retry condition was changed to 'attempts < 2', how many times would the code retry?

A Twice

B Once

C Three times

D No retries

💡 Hint

Refer to the retry condition column and variable_tracker for attempts count.

Concept Snapshot

Ruby retry lets you try a block again after an error.
Use 'retry' inside rescue to repeat.
Control retries with a counter.
Stops retrying when condition fails.
Useful for temporary errors like network calls.

Full Transcript

This example shows how Ruby's retry works. We start with attempts at 0. Each try increases attempts by 1. If attempts is less than 3, an error is raised and rescue triggers retry. This repeats until attempts reaches 3, then the code prints 'Success' and ends. The retry condition controls how many times the block runs again after failure. If the condition fails, the error is raised and program stops. This helps handle temporary errors by trying again automatically.