Send for calling methods dynamically in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to call the method dynamically using send.

Ruby

class Greeter
  def hello
    "Hello!"
  end
end

g = Greeter.new
puts g.[1](:hello)

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

Asend

Bcall

Cinvoke

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'call' instead of 'send' causes a NoMethodError.

Using 'invoke' or 'execute' are not valid Ruby methods for this purpose.

The send method in Ruby allows you to call a method by name dynamically.

2fill in blank

medium

Complete the code to call the method with an argument dynamically using send.

Ruby

class Calculator
  def square(n)
    n * n
  end
end

calc = Calculator.new
result = calc.[1](:square, 4)
puts result

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

Acall

Binvoke

Capply

Dsend

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'call' or 'apply' which are not Ruby methods for dynamic calls.

Forgetting to pass the argument after the method name.

send allows calling a method with arguments dynamically by passing the method name and arguments.

3fill in blank

hard

Fix the error in calling a private method dynamically using send.

Ruby

class Secret
  private
  def whisper
    "This is a secret"
  end
end

s = Secret.new
puts s.[1](:whisper)

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

Apublic_send

Bsend

Ccall

Dinvoke

Attempts:

3 left

💡 Hint

Common Mistakes

Using public_send causes NoMethodError for private methods.

Using call or invoke are not valid Ruby methods.

send can call private methods dynamically, while public_send cannot.

4fill in blank

hard

Fill both blanks to call a method dynamically and pass two arguments.

Ruby

class Multiplier
  def multiply(a, b)
    a * b
  end
end

m = Multiplier.new
result = m.[1](:multiply, [2], 5)
puts result

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

Asend

Bcall

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using call instead of send causes errors.

Passing wrong argument values.

send calls the method :multiply with arguments 3 and 5.

5fill in blank

hard

Fill all three blanks to call a method dynamically, pass an argument, and convert the result to a string.

Ruby

class Repeater
  def repeat(word, times)
    word * times
  end
end

r = Repeater.new
output = r.[1](:repeat, [2], 3).[3]

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

Asend

B"Hi"

Cto_s

Drepeat

Attempts:

3 left

💡 Hint

Common Mistakes

Using method name 'repeat' instead of send to call dynamically.

Not converting the result to string with to_s.

send calls :repeat with "Hi" and 3, then to_s converts the result to string.