HackerRank Ruby Hash Addition, Deletion, Selection Solution

Hello coders, In this post, you will learn how to solve HackerRank Ruby Hash Addition, Deletion, Selection 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.

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HackerRank Ruby Hash Addition, Deletion, Selection
HackerRank Ruby Hash Addition, Deletion, Selection

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HackerRank Ruby Hash Addition, Deletion, Selection

Let’s get started with Ruby Hash Addition, Deletion, Selection Solution

Problem Statement

In this challenge, we will show you ways in which we can add key-value pairs to Hash objects, delete keys from them, and retain them based on a logic.

Consider the following Hash object:

h = Hash.new
h.default = 0

  • A new key-value pair can be added using or the store methodh[key] = value


h.store(key, value)

  • An existing key can be deleted using the delete methodh.delete(key)
  • For destructive selection and deletion, we can use keep_if and delete_if as seen in Array-Selection> h = {1 => 1, 2 => 4, 3 => 9, 4 => 16, 5 => 25} => {1 => 1, 2 => 4, 3 => 9, 4 => 16, 5 => 25} > h.keep_if {|key, value| key % 2 == 0} # or h.delete_if {|key, value| key % 2 != 0} => {2 => 4, 4 => 16}


For non-destructive selection or rejection, we can use selectreject, and drop_while similar to Array-Selection

In this challenge, a hash object called hackerrank is already created. You have to add

  • A key-value pair [543121, 100] to the hackerrank object using store
  • Retain all key-value pairs where keys are Integers ( clue : is_a? Integer )
  • Delete all key-value pairs where keys are even-valued.

HackerRank Ruby Hash Addition, Deletion, Selection Solution

hackerrank.keep_if {|a| a.is_a? Integer}
hackerrank.delete_if {|a| a.even?}

Note: This problem (Ruby Hash Addition, Deletion, Selection) is generated by HackerRank but the solution is provided by Chase2Learn. This tutorial is only for Educational and Learning purpose.


1. What is Ruby programming?

Ruby programming is a high-level, interpreted, general-purpose programming language. It is designed for developing web applications and is known for its fast, concise, and easy-to-learn syntax. Ruby is used by many large tech companies such as Google, Facebook, and Twitter. Read more

2. Should I put HackerRank certificate on resume?

These certificates are useless, and you should not put them on your resume. The experience you gained from getting them is not useless. Use it to build a portfolio, and link to it on your resume. 

3. Can I retake HackerRank test?

The company which sent you the HackerRank Test invite owns your Test submissions and results. It’s their discretion to permit a reattempt for a particular Test. If you wish to retake the test, we recommend that you contact the concerned recruiter who invited you to the Test and request a re-invite. 

4. What is HackerRank?

HackerRank is a tech company that focuses on competitive programming challenges for both consumers and businesses. Developers compete by writing programs according to provided specifications. Wikipedia

5. Where can I find HackerRank Ruby solutions?

in this post, you will get all the solutions to HackerRank ruby Problems.

Finally, we are now, in the end, I just want to conclude some important message for you

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