Method objects with method() in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get a method object from the string 'hello'.

Ruby

str = 'hello'
method_obj = str.[1](:upcase)

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

Amethod

Bsend

Ccall

Ddefine_method

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of method returns the result, not a method object.

Using call directly on the string is invalid.

The method method returns a method object for the given method name.

2fill in blank

medium

Complete the code to call the method object and get the uppercase string.

Ruby

str = 'hello'
method_obj = str.method(:upcase)
result = method_obj.[1]()

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

Aapply

Bsend

Ccall

Dinvoke

Attempts:

3 left

💡 Hint

Common Mistakes

Using send on a method object is invalid.

Using apply or invoke are not Ruby methods.

The call method invokes the method object and returns the result.

3fill in blank

hard

Fix the error in the code to correctly get the length method object from an array.

Ruby

arr = [1, 2, 3]
length_method = arr.[1](:length)

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

Acall

Bmethod

Csend

Ddefine_method

Attempts:

3 left

💡 Hint

Common Mistakes

Using send calls the method instead of returning the method object.

Using call on the array is invalid.

The method method returns a method object; send calls the method immediately.

4fill in blank

hard

Fill both blanks to create a method object for 'reverse' and call it.

Ruby

text = 'world'
reverse_method = text.[1](:reverse)
result = reverse_method.[2]()

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

Amethod

Bsend

Ccall

Ddefine_method

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of method returns the result immediately.

Using send or define_method to call the method object is invalid.

First, get the method object with method, then call it with call.

5fill in blank

hard

Fill all three blanks to get the 'capitalize' method object from a string, call it, and store the result.

Ruby

word = 'ruby'
capitalize_method = word.[1](:capitalize)
result = capitalize_method.[2]()
puts [3]

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

Amethod

Bcall

Cresult

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using send instead of method to get the method object.

Printing the method object instead of the result.

Use method to get the method object, call to run it, and print the stored result.