Why dynamic typing matters in Ruby - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assign a string to the variable.

Ruby

name = [1]

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

A42

B:symbol

C"Alice"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number instead of a string.

Using a symbol when a string is expected.

In Ruby, you can assign a string directly to a variable without declaring its type.

2fill in blank

medium

Complete the code to add a number to the variable without declaring its type.

Ruby

age = [1]

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

A30

B:thirty

Cfalse

D"twenty"

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the number inside quotes, making it a string.

Using a symbol instead of a number.

Ruby allows assigning numbers directly to variables without type declarations.

3fill in blank

hard

Fix the error by completing the code to concatenate a string and a number using dynamic typing.

Ruby

result = "Age: " + [1].to_s

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

Aage

B"age"

C:age

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using the string "age" instead of the variable.

Using a symbol instead of the variable.

In Ruby, you convert numbers to strings with to_s before concatenation.

4fill in blank

hard

Fill both blanks to create a hash with dynamic keys and values.

Ruby

person = { [1] => [2] }

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

A:name

B"Alice"

Cage

D30

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string as a key instead of a symbol.

Using a number as a key or value incorrectly.

Ruby hashes can have symbols as keys and strings as values, showing dynamic typing.

5fill in blank

hard

Fill all three blanks to create a hash with mixed key types and values.

Ruby

data = { [1] => [2], [3] => 100 }

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

A:score

B42

C"level"

D:points

Attempts:

3 left

💡 Hint

Common Mistakes

Using strings instead of symbols for keys.

Mixing up keys and values.

This shows Ruby's dynamic typing by mixing symbols, strings, and numbers as keys and values.