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Floyd-Steinberg Dithering Example (Color)

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ASCII Art Image Converter

A Pen by Roberto on CodePen.

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import copy


def peers(i, j):
    row = set([(i, x)   for x in range(9)])
    column = set([(x, j)    for x in range(9)])

    start_row = 3 * (i // 3)
    start_col = 3 * (j // 3)
    square = set([

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# Sudoku Solver
#
# Go to the SudokuSolver module at the bottom to see the main module.
# To run the solver on a example input board, call `SudokuSolver.run/0`.
# The high-level backtracking logic is in the `SudokuSolver.solve/2` function;
# the other modules and their functions provide the supporting code for representing
# the board and performing simple tasks or providing utility functionality.


defmodule SudokuSolver.Cell do

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defmodule ArrayWrapper do
  @behaviour Access

  defstruct erlang_array: :array.new()

  @impl Access
  def fetch(%ArrayWrapper{erlang_array: array}, key)
  when is_integer(key) and (key >= 0) do
    case :array.get(key, array) do
      :undefined -> :error

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/*
Small and bare-bones Lisp parser and evaluator inspired by the respective problem posed at: https://www.recurse.com/pairing-tasks.
NOTE: This was my first time, as I had no previous experience with Lisp languages and only had some vague notions of them 
besides the fact that their notation is prefix-based, so this implementation might not be totally correct.
This was just for the sake of learning and experimenting. And only implements four function: +, *, list and first.
 */

function tokenize(input) {
    let validTokensRegExp = /(\w+|\(|\)|\+|\*)/g;
    let tokens = input.match(validTokensRegExp);

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SSE Handler Example with Plug and Cowboy 2

To run in the console, without supervision trees, do the following:

$ iex -S mix

iex> Plug.Adapters.Cowboy2.http(NormalRouter, [], [dispatch: PlugDispatch.dispatch()])

To run inside a supervision tree, make sure to call child_spec (or use a tuple) with the correct arguments, like in the following example: