Stack Server

Mix.install([
  {:jason, "~> 1.4"},
  {:kino, "~> 0.9", override: true},
  {:youtube, github: "brooklinjazz/youtube"},
  {:hidden_cell, github: "brooklinjazz/hidden_cell"}
])

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Stack

You’re going to create a Stack GenServer.

A stack is a common data structure similar to a list, however a stack can only push elements onto the top of the stack, and pop elements from the top of the stack.

Requirements

• The initial stack state starts as an empty list [].
• Create the push/2, pop/1, and start_link/1 functions as documented below.
• Define the necessary server callbacks that update the stack’s state.

{:ok, pid} = Stack.start_link([])

# Asynchronous
:ok = Stack.push(pid, 1)
:ok = Stack.push(pid, 2)
:ok = Stack.push(pid, 3)

# Synchronous
3 = Stack.pop(pid)
2 = Stack.pop(pid)
1 = Stack.pop(pid)
nil = Stack.pop(pid)

defmodule Stack do
  @moduledoc """
  iex> {:ok, pid} = Stack.start_link([])
  iex> :ok = Stack.push(pid, 1)
  iex> Stack.pop(pid)
  1
  iex> Stack.pop(pid)
  nil
  """

  use GenServer

  def start_link(_opts) do
  end

  def push(stack_pid, element) do
  end

  def pop(stack_pid) do
  end

  # Define the necessary Server callback functions:
end

Commit Your Progress

DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.

Run git status to ensure there are no undesirable changes. Then run the following in your command line from the curriculum folder to commit your progress.

$ git add .
$ git commit -m "finish Stack Server exercise"
$ git push

We’re proud to offer our open-source curriculum free of charge for anyone to learn from at their own pace.

We also offer a paid course where you can learn from an instructor alongside a cohort of your peers. We will accept applications for the June-August 2023 cohort soon.

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