jdfrens

#!/usr/bin/env ruby

# Generates a very opinionated `tasks.json` for Elixir projects.
#
# Usage (from the root of your project)
#
#   mkdir .vscode
#   cp .vscode/tasks.json .vscode/tasks.backup.json
#   task-maker > .vscode/tasks.json
#

jdfrens

defmodule GenericTransform do

  # Example: transform(list, &list_to_set/1)

  @spec transform(map | list | term, (term -> term)) :: map | list | term
  def transform(map, fun) when is_map(map) do
    Enum.reduce(map, %{}, fn {k, v}, acc ->
      acc
      |> Map.put(k, transform(v, fun))
      |> fun.()

jdfrens

require 'benchmark'

foo = [[8, nil], [8, 99]] * 10_000_000

Benchmark.bm(7) do |x|
  x.report("to_i") do
    foo.each { |(a, b)| [a, b.to_i].max }
  end
  x.report("compact") do
    foo.each { |(a, b)| [a, b].compact.max }

jdfrens

defmodule ExperimentBench do
  use Benchfella

  @list Enum.to_list(1..500_000) |> Enum.map(&to_string/1)

  bench "IO.puts" do
    file = File.open!("/tmp/puts.txt", [:write])
    Enum.each(@list, &(IO.puts file, &1))
    File.close(file)
  end

jdfrens

defmodule SillyExperiment do

  def strip_and_reverse(s), do: s |> String.strip |> String.reverse

  def all_stream do
    File.stream!("/usr/share/dict/words")
    |> Stream.map(&strip_and_reverse/1)
    |> Stream.each(&IO.puts/1)
    |> Stream.run
  end