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#Answer for Formulatrix Software Engineering Object-Oriented Test

I used Java to create this answer.
This answer Implementing a Formulatrix Queue class from an Queue interface that can accept integers for its capacity (defined in Object initialization) The Formulatrix Queue class below also have 2 methods as required in the question (enqueue and dequeue)

This is the code ###Queue.java

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# This one for terminal output
<?php 
$panjang = 10;
function double_pyramid($limit) { 
  global $panjang;
  if ($limit > 0) { 
  	echo str_repeat(' ', $panjang - $limit ).str_repeat('*', 2 * $limit - 1)."\n"; 
  	if ($limit > 1) {
  	  double_pyramid($limit - 1); 
  	  echo str_repeat(' ', $panjang - $limit ).str_repeat('*', 2 * $limit - 1)."\n";

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Ruby example question

Level of difficulty : Easy

Given two class definition, Car and Bus :

    class Car
      def honk
        puts "Teen, Teen"
 end

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def cetakPola(size=1)
  arr = Array.new(size)  { Array.new(size) }
  chars = (size**2).to_s.size
  maks = size-1
  x = maks / 2 
  y = maks / 2

  (1..size).each do |ps|
    start = (ps-1)**2 + 1
    ends  = ps**2

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import (
	"fmt"
	"math/rand"
	"regexp"
	"golang.org/x/crypto/bcrypt"
)

func ValidatePassword(hashedPassword, plainPassword string) (isValid bool) {
	hashedPasswordInBytes := []byte(hashedPassword)
	plainPasswordInBytes := []byte(plainPassword)

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def create_isbn13(isbn_12)
  isbn_arr = isbn_12.to_s.chars.map(&:to_i)
  sumarr = isbn_arr.each.with_index.inject(0) { |sum,(value,index)| index.even? ? sum+(value*1) : sum+(value*3) }
  last_digit = (10 - (sumarr % 10)) % 10
  isbn13 = isbn_12.to_s + last_digit.to_s
end

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# Generate EDDSA public key and private key 
{public_key, priv_key} = :crypto.generate_key(:eddsa, :ed25519)

# Payload that need to be signed
payload = "some_string"

# Generate signature with both public key and private key
signature = :public_key.sign(payload, :none, {:ed_pri, :ed25519, public_key, priv_key}, [])

# Verify signature with public key

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DBConnection.ConnectionPool.Supervisor
|> Supervisor.which_children()
|> Enum.each(fn {_, pid, _, _} ->
  [
    {{_adapter_prot, starter_pid, _worker_no}, _worker_pid, :worker, [_conn_module]}
    | _
  ] = children_list = Supervisor.which_children(pid)

  repo_name =
    starter_pid

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defmodule ConfigHelpers do
  @type config_type :: :str | :int | :bool | :json

  @doc """
  Get value from environment variable, converting it to the given type if needed.

  If no default value is given, or `:no_default` is given as the default, 
  an error is raised if the variable is not set.
  """
  @spec get_env(String.t(), :no_default | any(), config_type()) :: any()

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defmodule S3Downloads do
  @moduledoc """
  Use at your own risk.
  
  Code heavily borrowed from:
    - https://github.com/ex-aws/ex_aws/blob/main/lib/ex_aws/auth.ex
    - https://gist.github.com/chrismccord/37862f1f8b1f5148644b75d20d1cb073
    
  """