10 Ruby Basic Exercises for Advanced with Solutions

Master advanced Ruby skills with our comprehensive list of top 10 exercises. Dive into coding challenges that improve your understanding and proficiency in Ruby, setting a solid foundation for professional-level challenges. Start your journey to Ruby mastery today!

Learning Objectives:

Master advanced Ruby concepts such as metaprogramming, modules, mixins, and performance optimization. Enhance problem-solving abilities with complex challenges that require deep understanding and efficient coding techniques.

Exercise Instructions:

Start with the first exercise and attempt to solve it before checking the hint or solution.
Ensure you understand the logic behind each solution, as this will help you in more complex problems.
Use these exercises to reinforce your learning and identify areas that may require further study.

1. Generate an infinite Fibonacci sequence using Enumerator::Lazy and retrieve the first `n` Fibonacci numbers.

Required Input:

n = 10

Expected Output:

[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]

Code In Ruby

def fibonacci_lazy(n) # Your code here end puts fibonacci_lazy(10)

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2. Create a class that dynamically defines getter and setter methods for attributes based on an array of symbols.

Required Input:

attrs = [:name, :age]
 obj = Dynamic.new

Expected Output:

Ruby
30

Code In Ruby

class Dynamic def initialize # Your code here end end

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3. Multiply two matrices represented as arrays of arrays.

Required Input:

[[1, 2], [3, 4]] * [[5, 6], [7, 8]]

Expected Output:

[[19, 22], [43, 50]]

Code In Ruby

def matrix_multiply(a, b) # Your code here end

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4. Implement a class to represent an undirected graph using a hash where keys are nodes and values are arrays of connected nodes.

Required Input:

g = Graph.new; g.add_edge('A', 'B')

Expected Output:

{"A"=>["B", "C"], "B"=>["A"], "C"=>["A"]}
true
false

Code In Ruby

class Graph def initialize # Your code here end end

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5. Sort an array of words based on the number of vowels. If two words have the same count, sort alphabetically.

Required Input:

['apple', 'banana', 'cherry', 'date']

Expected Output:

["cherry", "apple", "date", "banana"]

Code In Ruby

def vowel_sort(words) # Your code here end

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6. Create a module `CustomEnumerable` that implements `map`, `select`, and `reduce` methods without using built-in Enumerable.

Required Input:

arr = [1, 2, 3]; arr.custom_map { |x| x * 2 }

Expected Output:

[2, 4, 6]

Code In Ruby

module CustomEnumerable def custom_map # Your code here end end

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7. Check if a given number is a power of two using bitwise operations.

Required Input:

Expected Output:

true

Code In Ruby

def power_of_two?(num) # Your code here end

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8. Demonstrate differences between Proc and Lambda.

Required Input:

Example method calls

Expected Output:

Before Proc

Code In Ruby

def proc_vs_lambda # Your code here end

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9. Solve the N-Queens problem for a given board size `n`.

Required Input:

n = 4

Expected Output:

. Q . . 
. . . Q 
Q . . . 
. . Q . 

. . Q . 
Q . . . 
. . . Q 
. Q . .

Code In Ruby

def n_queens(n) # Your code here end

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10. Extract all valid email addresses from a given string using regex.

Required Input:

'Contact me at [email protected] or [email protected]'

Expected Output:

["[email protected]", "[email protected]"]

Code In Ruby

def extract_emails(text) # Your code here end

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