Ruby on Rails Coding Interview Question: Find the Second Largest Number in an Array
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.
Write a Ruby method to find the second-largest number in an array
puts second_largest([5, 8, 2, 9, 1]) #=> 8
arr.max(2)is used to find the two largest numbers in the array. It returns an array containing the two maximum values from the original array. In this case, it would return
.minis then called on the resulting array from step 1 to find the minimum value, which corresponds to the second largest number. In this case, it would return
puts second_largest([5, 8, 2, 9, 1])calls the
second_largestmethod with the array
[5, 8, 2, 9, 1]and outputs the result, which is
This approach takes advantage of the built-in methods
min provided by Ruby. By finding the two maximum numbers and selecting the minimum of those two, we effectively obtain the second-largest number from the original array.
- The method utilizes the built-in methods
minto find the second-largest number in the
maxmethod, with an argument of 2, identifies the two largest elements with a time complexity of O(n), where n is the size of the input array.
- The resulting array is then passed to the
minmethod, which has a time complexity of O(2) or O(1) since it operates on a fixed-size array of 2 elements. As a result, the overall time complexity of the method is…