sofakingworld

defmodule StackImp do
  def pop(list) do
    # Возвращает кортеж с вынутым значением, и остатком списка.
    # подходит в качестве ответа для генсервера
    List.pop_at(list, 0)
  end

  def push(list, item) do
    new_list = [item | list]

sofakingworld

defmodule StackGenserverTest do
  use ExUnit.Case

  test "pops first item" do
    {:ok, pid} = StackGenserver.start_link([1, 2, 3])
    assert 1 == StackGenserver.pop(pid)
  end

  test "pops empty list" do
    {:ok, pid} = StackGenserver.start_link([])

sofakingworld

defmodule StackGenserver do
  use GenServer

  # Client

  def start_link(default) when is_list(default) do
    GenServer.start_link(__MODULE__, default)
  end

  def push(pid, item) do

sofakingworld

defmodule Foo do
  def bar do
    Application.get_env(:foo, :bar)
  end
end

Application.put_env(:foo, :bar, 3)

Foo.bar() # => 3

sofakingworld

Kernel's function with arity	BeautyKernel's alias
!=/2	not_eq?
*/2	multiply
++/2	list_concat
+/1	plus
+/2	plus
--/2	list_remove
-/1	minus
-/2	minus

sofakingworld

defmodule Dynamic do
  @methods ~w(method1 method2 method3)a

  @methods 
  |> Enum.each( fn method ->
    method_name = "prefix_#{method}"
    def unquote(:"#{method_name}")(argument1, argument2) do
      {unquote(method), argument1, argument2}
    end
  end)

sofakingworld

# For MacOS and "Postgres" App Users
# where var-10 is version of postgreSQL

cd /Users/$USER/Library/Application\ Support/Postgres/var-10/ 
rm postmaster.pid

sofakingworld

.....
config :logger, :console,
  level: :debug,
  format: {LoggerFormatter, :format_log}, 

sofakingworld

Array.prototype.eachSlice = function(size=1) {
    return Array(Math.ceil(this.length / size))
		.fill()
       		.map(( _, idx) => {
            return this.slice(idx * size, (1 + idx) * size)
        })
}

sofakingworld

/*
Making btree_gin index and using it in search
*/

CREATE EXTENSION btree_gin;
create index ix_table_1 on table_1 USING GIN (to_tsvector('simple', coalesce(table_1.seach_field.value::text, '')), table_1.id)

select * from table_1 
where to_tsvector('simple', coalesce(table_1.seach_field.value::text, '')) @@ to_tsquery( 'example:*' );
-- index used