HackerRank Ruby Array Index Part 2 Solution

Hello coders, In this post, you will learn how to solve HackerRank Ruby Array Index Part 2 Solution. This problem is a part of the Ruby Tutorial series. One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions.

HackerRank Ruby Array Index Part 2 Solution

Let’s get started with Ruby Array Index Part 2 Solution

Problem Statement

Here are some other ways to access array objects in Ruby.

To access the elements from the end of the list, we can use negative indices.

For the array,

arr = [9, 5, 1, 2, 3, 4, 0, -1]

 > arr[-1]
 => -1

The first element of the array can be accessed using

 > arr.first
 => 9

The last element of the array can be accessed using

 > arr.last
 => -1

The first n elements of the array can be accessed using

 arr.take(3)
 => [9, 5, 1]

Everything but the first n elements of the array can be accessed using

 arr.drop(3)
 => [2, 3, 4, 0, -1]

In this challenge, you have to use the syntax as explained above and complete the functions accordingly.

HackerRank Ruby Array Index Part 2 Solution

def neg_pos(arr, index)
    # return the element of the array at the position `index` from the end of the list
    # Clue : arr[-index]
    return arr[-index]
end
def first_element(arr)
    # return the first element of the array
    # arr.first
    return arr.first
end
def last_element(arr)
    # return the last element of the array
  return arr.last
end
def first_n(arr, n)
    # return the first n elements of the array
  arr.take(n)
end
def drop_n(arr, n)
    # drop the first n elements of the array and return the rest
  arr.drop(n)
end

Note: This problem (Ruby Array – Index, Part 2) is generated by HackerRank but the solution is provided by Chase2Learn. This tutorial is only for Educational and Learning purpose.