Questions tagged [ruby]
Ruby is a multi-platform, open-source, dynamic, object-oriented, interpreted language created by Yukihiro Matsumoto (Matz) in 1993.
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Write your implementation of Ruby's String#count method
The task is to write a simplified version of Ruby's String#count method oneself. Simplified because it doesn't have to have the negation and sequence parts of the original.
Here my solution:
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Solution to the n-queens puzzle in Ruby
I started studying programming in January of this year and found a free online course that teaches Ruby. Below is my solution to the Eight Queens problem.
I wanted my solution to be able to return any ...
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Finding the lowest perfect square that can be added to a number to make another perfect square
The code below returns the smallest perfect square that can be added to a number n to result in a perfect square. It works perfectly fine but I need it to run ...
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Caesar Cipher, done in Ruby
It's an assignment from the Odin Project.
Here's my implementation:
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Ruby script implementation
I created a script to automate the task of uploading a CSV file to Box. I have a couple of files a Box client and a MySQL client. I create an instance of both on the function.rb file which is the one ...
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Ruby function to capitalize all words in a string
The task is to write a function, which capitalize the first letter of all words in a string. For this we'll class a word as any characters separated by a blank. Because the standard ...
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API Get Request to pull data from an online database
This code gets detailed information about a particular game from an online database using an API Get request. The question I have doesn't pertain to the request but is more about the code itself. The ...
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Ruby simple interactive interpreter
This is a solution to this problem: https://www.codewars.com/kata/53005a7b26d12be55c000243/train/ruby
The task is to make a simple interpreter that will take expressions and calculate the results. I'...
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Ruby Exercise: Implement your own "#group_by" method
Task:
"Implement a method 'gruppiere', in a way that it can be invoked on all enumerable objects (Enumerable). The method receives a block and returns a hash. The items of the enumerable a grouped ...
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Ruby - Sending commands to multiple servers using Net::SSH
The idea
At my work, I'm tasked with retrieving logs for a list of online orders from a total of 12 servers. To do this, I SSH into them (with a jump host in between) one by one, run the script for ...
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Profitwell API wrapper build as Ruby gem
I've created my first gem in Profitwell API wrapper https://github.com/eebasadre20/profitwell. I love to get some feedback, comment, or suggestion on the code structure, method implementations, and so ...
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Linked List implementation in Ruby
I was working on Leet code design a Linked List problem. My solution with a @tail pointer, althought it added complexity it made adding to tail O(1), also having a ...
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Presenter pattern implementation
I've recently discovered patterns and decided to implement Presenter pattern inside a pedagogical project. I spent few days playing around with different implementations, reading some Gem's source ...
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Building google maps inside a ruby on rails application
This is a basic map that was built:
To render it, you would put this in the .html.slim files
.acme-map-container-4 data=map_identifier(resource: @warehouse.id)
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Encapsulating Logic to Reuse in Various Contexts
I'm experimenting with ways to reuse code throughout a Rails web app. I'm interested in feedback concerning one such approach!
Context
A user's request may be scoped to a physical location so that ...
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Rails 6: Attaching Devise current_user.id to form submissions
In my Ruby on Rails 6 app:
I have a User class built with Devise, and I scaffolded a List class where each List should belong_to a User.
I want Lists created through my app to be automatically ...
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FizzBuzz encapsulation In Ruby (identifying and separating concerns)
I'm working on an article about encapsulation in OOP, and I'm using the FizzBuzz problem to demonstrate what I think is so great about it. I'm hoping to share this with developers that might also be ...
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Case of Cyclomatic Complexity
I'm trying to recreate the method inject (Works like Reduce) from ruby Enumerable Module.
Using Rubocop (A Linter) I got the error:
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Return values from array A in the order they are in array B
So my question is the cleanest way to do #product_panels_for below:
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custom hash from group_by hash
I am trying to create a custom hash from a table. User has many transactions. A transaction has a ...
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Advent of Code Day 3, how to optimize my ruby solution?
I have solved the 3rd day puzzle of Advent of Code but wanted some feedback on my solution. The puzzle here wants to find where two jumbled wires intersect closest to the origin.
Puzzle input is ...
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Comparing verbosity of algorithmic Ruby class
At a high level, I'm writing a Ruby class that compares components on two differing versions of the same JSON structure, which in turn decides whether or not said elements should be updated on a PDF ...
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Remove multiple array elements by indices
I prepared a method to make possible to select elements of the array except for some indexes.
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Tentative to transform this scrape script into a class object program
From the last few days I have been studying scraping webpages and for further development I challenge myself to transform the script I have created into a class which will receive inputs from a user.
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Ruby coin toss probability tool
I haven't been programming for a while, I wanted to do a simple project to warm myself up and get back into the game; I made this simple tool that finds the probabilities of coin toss combinations. ...
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Change architecture of Ruby app to be more object oriented, readable
I'm working on a Slack bot for service desk which sends direct message to user on a Slack when their ticket will be on user_action_needed status. I'm using AWS ...
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Rails: create a relationship between comment and user
I'm trying to connect the create of a comment to the current_user. I have a model comment which is a polymorphic association.
<...
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Concatenate unless note [closed]
mails = []
mails.concat(@note.cc_emails) unless @note.cc_emails.nil?
mails.concat(@note.to_emails) unless @note.to_emails.nil?
Everything what I'm doing here is ...
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Rock, Paper, Scissors completed game
I have just completed my first Ruby OOP project. Fairly simple but still a bit time consuming as I am still learning the language.
I would like feedback and ways I can improve on this and make the ...
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Rails Helper to display rating in stars
Using Rails 6. Here's a piece that I wrote just to display number of stars. Obviously I am disgusted by my own code. How would you refactor?
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Assigning raffle numbers to users in Rails
Background
One part of our Rails app is running a Raffle, usually twice a month, with around 600k entrants each round. Each raffle ticket record will have at least a unique raffle number (consisting ...
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Ruby script for automating software install on a brand new Linux OS
I have some scripts to automate software install, apply some configurations and so on after installing a new system.
I used to have them as bash scripts but it was generally a poor idea.
I have ...
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RSpec shared example for CRUD Controllers that might be nested or not
I've been trying to create a shared example to quickly and efficiently test controllers with CRUD operations that might also be nested.
I came up with this ...
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Removing duplicate hashes in an array while keeping count of the times the hash was present
I have an array of hashes (price_params['items']) where each item has a key called quantity what I'm trying to do is to clean ...
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Translator method failing to translate two words [closed]
Sorry if this has been answered to death—I'm working on a pig latin translator for Odin Project. The code below works fine for individual words, but when it receives two words ("eat pie"), the output ...
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Ruby code to parse and analyze social media stats in json format
What do you think about this code I wrote.
It reads several json files ( I attached them as pastebins)
and the code outputs summary information calculated from the input.
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Incremental, encrypted backups for git
I would appreciate any review of the following script I recently posted on GitHub (gitcrypto). Most notably, I would be interested in a review of the cryptographic aspects (I am not an expert in this ...
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Ruby: Remove middle node from Linked List
Currently, I'm going over the CTCI, I'm working on the problem removing the middle node. I'm using Ruby to go over these problems. I have the following solution.
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Store personal data for later use
I'm new with Ruby and am trying to improve my coding skills. This program gets personal information for three people, and then prints them.
It works, but I'm sure it's not the best and certainly not ...
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Easily interacting with two external apis
Recently I rewrote some methods/functions written by a previous developer mostly due to the fact that the previous implementation overdid the whole 'OO' thing, and used inheritance inappropriately. ...
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better multiple fields validation on ruby/rails
I have a form for an item (Job Item), that has sets of 2 fields based on a type.
field and field + _dolar
e.g: ...
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Repeater for blocks of Ruby
I've written a module for repeating blocks of code, generally to cover issues related to eventual consistency and testing screen elements which may take some time to fully load. It looks like this:
<...
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Command-line implementation of Mastermind
I just finished this command-line implementation of the Mastermind board game that allows two players to play against each other. I'm fairly new to Ruby, but I think I did a decent job with this. ...
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Remove duplicates from an unsorted Linked List in Ruby
Currently I'm going over the cracking the coding interview. I'm in the Linked List 2.1 question which is as follow:
Remove Duplicates, write code to remove duplicates from an unsorted
Linked List....
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Rails initializer to be more clean [closed]
I need a little bit of refactor my initialize method because I think it will make initializer more flexible and readable.
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Dynamically combine ActiveRecord Relation results [closed]
This isn't the actual use-case I have but for simplicity, let's say I have an ActiveRecord Animal model in a Rails app. The Animals have a name (string) and ...
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ActiveRecord Query for many to many association
I have two Models in my Rails 6 / PostgreSQL application which have a many to many relation; Car and Driver. The goal is to get ...
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Calculating p-value for Welch's t-test
I am attempting to translate some of my Perl code to Ruby, from http://rosettacode.org/wiki/Welch%27s_t-test
I am a very very beginner with Ruby, but I have verified that this is producing the ...
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Identifying the missing number in an array
This is from LeetCode:
Missing Number
Given an array containing n distinct numbers taken from 0, 1, 2, ...,
n, find the one that is missing from the array.
Example 1:
Input: [3,0,1]...
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