Define_method for dynamic methods in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a method dynamically using define_method.

Ruby

class Greeter
  define_method(:[1]) do |name|
    "Hello, #{name}!"
  end
end

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

Agreet

Bsay_hello

Chello

Dwelcome

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string instead of a symbol for the method name.

Choosing a method name that does not match the greeting context.

The method name to define dynamically is greet. Using define_method(:greet) creates a method called greet that takes a name and returns a greeting.

2fill in blank

medium

Complete the code to define a method dynamically that returns the square of a number.

Ruby

class Calculator
  define_method(:[1]) do |x|
    x * x
  end
end

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

Asquare

Bcube

Cdouble

Dmultiply

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a method name that does not match the operation.

Using a method name that implies a different calculation.

The method name square matches the operation of returning the square of a number.

3fill in blank

hard

Fix the error in the code to define a method dynamically that returns a greeting with a given name.

Ruby

class Person
  define_method([1]) do |name|
    "Hi, #{name}!"
  end
end

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

A"greet"

B:greet

Cgreet

D'greet'

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the method name instead of a symbol.

Using a bare word without colon which is undefined.

The method name must be a symbol, so :greet is correct. Using strings or bare words causes errors.

4fill in blank

hard

Fill both blanks to define dynamic methods for addition and subtraction.

Ruby

class MathOps
  define_method(:[1]) do |a, b|
    a + b
  end

  define_method(:[2]) do |a, b|
    a - b
  end
end

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

Aadd

Bsubtract

Cmultiply

Ddivide

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing method names with operations they don't perform.

Using method names for multiplication or division instead.

The first method is named add for addition, and the second is subtract for subtraction.

5fill in blank

hard

Fill all three blanks to define dynamic methods for multiplication, division, and modulus.

Ruby

class AdvancedMath
  define_method(:[1]) do |a, b|
    a * b
  end

  define_method(:[2]) do |a, b|
    a / b
  end

  define_method(:[3]) do |a, b|
    a % b
  end
end

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

Amultiply

Bdivide

Cmodulus

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect method names that don't match the operation.

Confusing modulus with division or multiplication.

The methods are named multiply, divide, and modulus matching their operations.