Looping

Question 1

How do you make a loop method using the loop construct?

Answer 1

loop do
  #your code here
end

Question 2

How many times will the following code run?

loop do
  #your code here
end

Answer 2

An infinite amount of times.

Question 3

How many times will the following code run?

loop do
  #your code here
  break
end

Answer 3

Once

Question 4

How many times will the following code run?

counter = 0
loop do
counter = counter + 1
puts “Iteration #{counter} of the loop”

if counter >= 10
break
end
end

Answer 4

10 times

Question 5

How can we rewrite the following code using += instead?

counter = counter + 1

Answer 5

counter += 1

Question 6

What does the following code do to the variable age?

age = 20
age += 1

Answer 6

Reassigns the variable age to the value of 21

Question 7

How do you make a loop method using the times construct?

Answer 7

5.times do
puts “Penguins like to jump off icebergs!”
end

Question 8

How many times will the following code run?

7.times do
puts “I am doing the dishes left by my former friends.”
end

Answer 8

7 times.

Question 9

What will the value of jewels_in_bag be after the code has run?

jewels_in_bag = 100

3.times do
puts “Hiding 10 stolen jewels.”
jewels_in_bag = jewels_in_bag - 10
end

Answer 9

70

Question 10

How can we rewrite the following code using -= instead?

jewels_in_bag = jewels_in_bag - 10

Answer 10

jewels_in_bag -= 10

Question 11

How many times will the following code run?

x=0
while x < 10 do
puts “so many loops”
end

Answer 11

An infinite amount of times.

Question 12

True or False: The line in the following loop puts “Hi” will never run.

10.times do
break
puts “Hi”
end

Answer 12

True

The break stops the loop from reaching the line puts “Hi”

Question 13

How would you read this code in sentences?

counter = 0
while counter < 20
  puts "The current number is less than 20."
  counter += 1
end

Answer 13

Variable counter is 0.

While counter is less than 20, output “The current number is less than 20.”, then increment counter by 1.

Question 14

How would you read this code in sentences?

counter = 0
until counter == 20
  puts "The current number is less than 20."
  counter += 1
end

Answer 14

Variable counter is 0.

Until counter is equal to 20, output “The current number is less than 20.”, then increment counter by 1.

Question 15

How is the until loop different from the while loop?

Answer 15

Until is simply the inverse of a while loop. An until keyword will keep executing a block until a specific condition is true. In other words, the block of code following until will execute while the condition is false. One helpful way to think about it is to read until as “if not”.