koolquark’s gists

koolquark / ruts-random.rs

Created December 12, 2021 15:47

	use sha2::{Digest, Sha256};
	use std::path::{Path, PathBuf};

	fn hash(data: String) -> [u8; 32] {
	let mut hasher = Sha256::new();
	hasher.update(data.as_bytes());
	let r: [u8; 32] = hasher
	.finalize()
	.as_slice()
	.try_into()

koolquark / Main.elm

Created July 23, 2019 04:37

Elm select list - updated to 0.19

	-- See https://stackoverflow.com/questions/37376509/work-with-elm-and-select
	-- Modified for Elm 0.19

	import Html exposing (..)
	import Html.Events exposing (on)
	import Html.Attributes exposing (..)
	import Json.Decode as Json
	import String
	import Html.Events.Extra exposing (targetValueIntParse)
	import Browser exposing (sandbox)

koolquark / if_compact.ex

Created June 21, 2019 16:27

Elixir - One-liner if

if v, do: "v", else: "no_v"

koolquark / anon_call.ex

Last active June 21, 2019 16:25

Elixir - Calling anonymous function at definition itself

	(fn true -> IO.puts("yes its true") end).(true)

	# Example
	"hello" \|> ( fn msg -> IO.puts(msg) end ).()

koolquark / try_catch_throw.ex

Created June 21, 2019 16:04

Elixir - try catch throw example

	defmodule Excep do

	def ex() do
	try do
	throw("a")
	catch
	c ->
	IO.inspect c # "a"
	end
	end

koolquark / match_params.ex

Created June 21, 2019 15:51

Matching two parameter values at function head

	defmodule FnEx do
	def m( %{ :a => a } , a ) do
	IO.puts "Hello"
	end
	end

koolquark / stack_trace.ex

Created June 21, 2019 15:42

Get Current Stack Trace in Elixir

Process.info(self(), :current_stacktrace)

koolquark / map_match.ex

Created June 21, 2019 11:06

Elixir - Map matching at function head

	defmodule MapTest do
	def hmap(%{ :a => "a"} = changeset) do
	IO.inspect changeset
	end
	end

	MapTest.hmap(%{ :a => "a", :b => "B" }) # matches
	MapTest.hmap(%{ :a => "A", :b => "B" }) # clause error

koolquark / mongodb_erlang_skip_batch_size.txt

Created December 2, 2018 10:05

mongodb erlang skip and batchsize

	2> application:ensure_all_started(mongodb).
	{ok,[bson,poolboy,pbkdf2,mongodb]}
	3>
	3> Database = <<"test">>.
	<<"test">>
	4> {ok, Connection} = mc_worker_api:connect ([{database, Database},{w_mode, safe}]).
	{ok,<0.181.0>}
	5>
	5> % Drop all the docs
	5> Collection = <<"test">>.

koolquark / postgresql.md

Last active November 21, 2018 19:10

Postgresql Create Database and User

CREATE DATABASE hello_dev;
CREATE USER devel WITH ENCRYPTED PASSWORD 'devel';
GRANT ALL PRIVILEGES ON DATABASE hello_dev TO devel;
ALTER USER devel CREATEDB;
# Also pg_hba.conf 
local all devel md5

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