Preparing for a Ruby on Rails coding interview may be a stressful commitment. With the correct information and practice, though, you can confidently demonstrate your skills and obtain your desired job. I present a detailed list of frequent Ruby on Rails coding interview questions in this blog article to help you prepare efficiently.
I encourage readers to practice coding challenges, review the Rails documentation, and seek additional resources to enhance their understanding of Ruby on Rails. Armed with this knowledge, you’ll be well-equipped to excel in Ruby on Rails coding interviews and secure your desired position in web development.
Question
Write a Ruby method to reverse a string.
Solution 1:
Here’s a Ruby method that reverses a string using built-in methods:
def reverse_string(str)
str.reverse
end
puts reverse_string("Hello, world!") #=> "!dlrow ,olleH"This method makes use of Ruby’s String class’s reverse method. It returns the reversed version of the supplied string directly.
Time Complexity
The reverse method typically has a time complexity of O(n), where n is the length of the input string. It iterates over the characters of the string and creates a new reversed string.
Space Complexity
The space complexity of the reverse_string method is O(n) as well. When the reverse method is called, it creates a new string object that contains the reversed version of the input string. The space required to store the reversed string is proportional to the length of the input string.
Solution 2:
To reverse a string without using any built-in methods, use a method similar to the one described above:
def reverse_string_without_builtin(string)
reversed = ""
length = string.length
(length - 1).downto(0) do |i|
reversed += string[i]
end
reversed
end
puts reverse_string_without_builtin("Hello, world!") #=> "!dlrow ,olleH"This method follows the same logic as before. It initializes an empty string called reversed, gets the length of the input…
