Loop method for infinite loops in Ruby - Step-by-Step Execution

Concept Flow - Loop method for infinite loops

Start Loop

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Execute Block

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Repeat Automatically

↩Back to Start Loop

The loop method runs a block of code repeatedly without stopping, creating an infinite loop until manually stopped.

Execution Sample

Ruby

count = 1
loop do
  puts count
  count += 1
  break if count > 3
end

This code uses loop to print numbers 1 to 3, then stops the infinite loop with break.

Execution Table

Step	count	Action	Output	Condition for break
1	1	Print count, increment count	1	count=2, not >3, continue
2	2	Print count, increment count	2	count=3, not >3, continue
3	3	Print count, increment count	3	count=4, >3, break loop
Exit	4	Loop ends due to break		count=4 > 3, loop stops

💡 Loop stops when count becomes 4, because break condition count > 3 is true.

Variable Tracker

Variable	Start	After 1	After 2	After 3	Final
count	1	2	3	4	4

Key Moments - 2 Insights

Why doesn't the loop run forever here?

Because inside the loop we use 'break if count > 3' which stops the loop when count reaches 4, as shown in execution_table row 3.

What happens if we remove the break statement?

The loop will run forever printing numbers endlessly, because loop method repeats infinitely unless break is called.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of count at Step 2?

A 2

B 3

C 1

D 4

💡 Hint

Check the 'count' column in execution_table row for Step 2.

At which step does the loop stop running?

A Step 1

B Step 3

C Exit

D Step 2

💡 Hint

Look at the 'Condition for break' column where count > 3 triggers break.

If we remove the break condition, what will happen to the loop?

A It will stop after 3 iterations

B It will run zero times

C It will run forever

D It will print only once

💡 Hint

Refer to key_moments explanation about loop without break.

Concept Snapshot

Ruby's loop method runs a block endlessly.
Use 'break' inside to stop the loop.
Without break, loop runs forever.
Syntax:
loop do
  # code
  break if condition
end

Full Transcript

This example shows how Ruby's loop method creates an infinite loop by repeating the block inside it. We start with count = 1. Each loop iteration prints count, then increases it by 1. We use 'break if count > 3' to stop the loop when count reaches 4. The execution table tracks each step: printing count, incrementing it, and checking the break condition. The variable tracker shows count changing from 1 to 4. Key moments explain why the loop stops and what happens without break. The quiz tests understanding of count values and loop stopping conditions. Remember, loop repeats forever unless you use break to exit.