Ruby Loops

Table of Contents

1. for loops

2. while loops

3. until loops

4. loop loops

5. .times iterator loop

A 'for' loop:

for i in 1..50
    puts "#{i}"
end

1. For every number between 1 - 50

2. Using the inclusive .. operator tells the computer to include the last number in the loop

3. Will puts numbers 1 - 50

4. Using the exclusive ... operator tells the computer to exclude the last number from the loop

5. Will puts the numbers 1-49

6. Display the number on the console

7. Ends instructions for the loop

A 'while' loop:

i = 1
while i <= 50
    puts "#{i}"
    i += 1
end

1. Sets variable i equal to one

2. While i is less than or equal to 50, do the block of code (will print numbers 1 -50)

3. Display the number on the console

4. Increment i by one every time, that way the loop will end at some point

5. Ends instructions for the loop

An 'until' loop:

i = 1
until i > 50
    puts "#{i}"
    i += 1
end

1. Sets variable i equal to one

2. Until i is greater than 50, run the block of code (will print numbers 1-50)

3. Display i on the console

4. Increment i by one every time, that way the loop will end at some point

5. End the instructions for the loop

A 'loop' loop:

i = 1
loop do
    puts "#{i}"
    i += 1
    break if i > 50
end

1. Sets variable i equal to one

2. Create a loop, and run the block of code

3. Display i on the console

4. Increment i by one every time, that way the loop will end at some point

5. Break the loop if i becomes greater than 50

6. End the instructions for the loop

A '.times' iterator loop:

5.times do
    puts "Hello world!"
end

1. Run this loop five times, and do the block of code

2. Display the string on the console

3. End the instructions for this loop