apboobalan

Verifying myself: I am apboobalan on Keybase.io. 1f56MIWYtg-rhu4f7dU146zx69uTyHkTK-Xf / https://keybase.io/apboobalan/sigs/1f56MIWYtg-rhu4f7dU146zx69uTyHkTK-Xf

apboobalan

Keybase proof

I hereby claim: * I am apboobalan on github. * I am apboobalan (https://keybase.io/apboobalan) on keybase. * I have a public key ASB-iyrDuLWjant6ITMdFLdEr3hbQ9NyU2VH_8CsAgOcAwo To claim this, I am signing this object:

{   "body": {     "key": {       "eldest_kid": "01207e8b2ac3b8b5a36a7b7a21331d14b744af785b43d372536547ffc0ac02039c030a",       "host": "keybase.io",       "kid": "01207e8b2ac3b8b5a36a7b7a21331d14b744af785b43d372536547ffc0ac02039c030a",       "uid": "8f124505ff7c983056f3c82f46119919",       "username": "apboobalan"     },     "merkle_root": {       "ctime": 1580020156,       "hash": "e0d8fd66fe3baa0a6c6dcdf2e52e0bfdbdaad42673ebe062fd836a532cbcc2a77d5968d4138a6fc496c4c1c5fe7f6c2d48c55bb8f4e86abbd066a56ab29ab4f5",       "hash_meta": "578d3e9036130e30704b79838a10e6417652c9eaf7c7fd0e47479c9ea9773209",       "seqno": 14367447     },     "service": {       "entropy": "YVu0o+FLVp0GNvREKV2SFT7R",       "name": "github",       "username": "apboobalan"     },     "type":

apboobalan

defmodule Streamy do
  def start do
    start = fn -> 0 end
    next = fn value -> {[value + 1], value + 1} end
    stop = fn value -> value end
    Stream.resource(start, next, stop)
  end
end

require Integer

apboobalan

• Scalability triangle
  • Performance, maintenance, cost
• WS lifecycle
  • inspect ws inside browser dev tools
  • Initial call is made using HTTP and then 101 protocol switch response is received and the connection is upgraded to ws
  • Optional heartbeat messages are used in check connection.
  • Phoenix pings server every 30 seconds.
  • Server will close connection if it doesn't receive ping within 60 seconds.
  • use wss:// for security.
  • ws doesn't follow CORS policy.

apboobalan

• To define type spec for a functions @spec function_name(arg_1_type, arg_2_type) :: return_type
• To define new type@type new_type_name :: existing_type
• To document type place @typedoc """ description """ above type definition.
• We can create product types such as lists, tuples and maps using their own syntax with members being the types.
• Eg. Product types

@type statuses :: [atom]

@type number_with_remark :: {number, String.t}

apboobalan

defimpl Enumerable, for: BitString do
  def count(string), do: {:ok, string |> String.length()}

  def member?(string, substring), do: {:ok, string |> String.contains?(substring)}

  def slice(string),
    do:
      {:ok, string |> String.length(),
       fn start_position, end_position ->
         string

apboobalan

defmodule Validator do
  defmacro having({:in, _, [lhs, rhs]}) when lhs |> is_binary and rhs |> is_binary,
    do: rhs |> String.contains?(lhs)

  defmacro having({:in, _, [_lhs, _rhs]}), do: false
end

apboobalan

defmodule TaskiFirst.Taski do
  def async(fun) do
    spawning_process = self()
    spawn(fn -> spawning_process |> send(fun.()) end)
  end

  def await() do
    receive do
      result -> result
    end

apboobalan

defmodule Taski.Taski do
  def async(fun) do
    spawning_process = self()
    spawn(fn -> spawning_process |> send({self(), fun.()}) end)
  end

  def await(pid) do
    receive do
      {^pid, result} -> result
    end