ERB template syntax in Ruby on Rails - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to output the value of name in an ERB template.

Ruby on Rails

<p>Hello, <%= [1] %>!</p>

Drag options to blanks, or click blank then click option'

Aname

Bprint(name)

Cecho name

Dputs name

Attempts:

3 left

💡 Hint

Common Mistakes

Using Ruby methods like print or puts inside <%= %> which is unnecessary.

Forgetting to use <%= %> and using <% %> which does not output.

In ERB, <%= %> outputs the value of the Ruby expression inside. You just need the variable name name to display its value.

2fill in blank

medium

Complete the ERB code to run Ruby code without outputting anything.

Ruby on Rails

<% [1] %>

Drag options to blanks, or click blank then click option'

Aputs x

Bx

Cx = 5

Dprint x

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to output with <%= %> when you only want to run code.

Using methods like puts or print inside <% %> which won't show output.

Use <% %> to run Ruby code without output. Assigning x = 5 inside is correct.

3fill in blank

hard

Fix the error in this ERB code to correctly output the result of 2 + 3.

Ruby on Rails

<%= 2 + [1] %>

Drag options to blanks, or click blank then click option'

A2

B+

Cfive

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the plus sign again causing syntax errors.

Using a word like 'five' which is not a number.

The expression 2 + 3 adds two numbers. You need to fill in 3 to complete it.

4fill in blank

hard

Fill both blanks to create a loop in ERB that outputs numbers 1 to 3.

Ruby on Rails

<% (1..3).[1] do |num| %>
  <p><%= num [2] 0 %></p>
<% end %>

Drag options to blanks, or click blank then click option'

Aeach

B+

C%

Dtimes

Attempts:

3 left

💡 Hint

Common Mistakes

Using times on a range which is invalid.

Using % instead of + inside the output, causing division by zero.

each loops over the range 1 to 3. Inside, num + 0 outputs the number itself (1, 2, 3).

5fill in blank

hard

Fill all three blanks to create a conditional in ERB that outputs 'Even' or 'Odd' for numbers 1 to 3.

Ruby on Rails

<% (1..3).each do |num| %>
  <% if num [1] 2 [2] 0 %>
    <p>Even</p>
  <% else %>
    <p>[3]</p>
  <% end %>
<% end %>

Drag options to blanks, or click blank then click option'

A%

B==

COdd

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using != instead of == causing logic errors.

Forgetting to output 'Odd' in the else block.

The condition checks if num % 2 == 0 to find even numbers. If true, it outputs 'Even', else outputs 'Odd'.