Qqwy’s gists

Qqwy / IsPrime.hs

Last active February 12, 2018 18:09

Prime Checker without doing any division or modulo

	{-#OPTIONS_GHC -O2 -optc-O3 #-}

	{-
	Author: Wiebe-Marten Wijnja
	Date: 2018-02-12

	This simple program is a Prime Checker.
	It is special, in that does not perform any
	division or modulo operations to check if a number is a prime,
	which most prime checkers or prime sieves do.

Qqwy / scream.ex

Last active July 19, 2017 03:15

How exclamation marks are supposed to be used in Elixir

	defmodule Scream do
	defmacro scream!(ast) do
	{exclams, res} = count_exclams(ast, 0)
	case exclams do
	_ when exclams < 5 ->
	quote do "You say: #{inspect(unquote(res))}." end
	_ when exclams < 10 ->
	quote do "You yell: #{inspect(unquote(res))}!" end
	_ when exclams < 15 ->
	quote do "You scream: #{inspect(unquote(res))}!!" end

Qqwy / early_exit.cc

Created September 12, 2016 14:45

Shows why early exit on failure is a good code style strategy.

	/*
	In this snippet, the failure cases are not close to the conditions they belong to.
	This makes it hard to track when which error case is triggered (especially when they are more than a screen height apart).

	It also adds a lot of `{}` and indentation.
	*/
	int someFunction(int foo, int bar, int baz)
	{
	if (foo == 1)
	{

Qqwy / modulo.ex

Created August 8, 2016 18:42

	defmodule Modulo do

	defmacro guard_safe_int_max(a, b) do
	quote do
	div(unquote(a)+unquote(b) + abs(unquote(a) - unquote(b)), 2)
	end
	end

	defmacro int_sign(x) do
	quote do

Qqwy / elixir_operator_info.exs

Created July 7, 2016 20:01

Elixir Operator Info

	# See https://github.com/elixir-lang/elixir/blob/master/lib/elixir/src/elixir_parser.yrl#L52
	# for the list of operators with associativity, etc.


	# The operators in this list are grouped by precedence, low to high.
	# The comments indicate the operator's normal function, as well as its ability to be defined/overridden.

	-> # CompileError 'unhandled operator'. only allowed in anonymous function syntax.

	& # CompileError, only allowed in short anonymous function syntax.

Qqwy / ZigZagConversion.ex

Last active May 13, 2016 14:43

Elixir-solution for https://leetcode.com/problems/zigzag-conversion/

	defmodule ZigZagConversion do
	@moduledoc """
	Qqwy's solution to https://leetcode.com/problems/zigzag-conversion/
	"""


	@doc """
	Converts a string into a zig-zagged string:

	- the characters of string is distributed over `num_rows`, as follows:

Qqwy / base64_image_uploader.js

Created February 18, 2016 23:46

	function base64ImageUploader(dialog) {
	var reader, image_url, img;
	var canvas = document.createElement("canvas");
	var canvas_context = canvas.getContext('2d');


	function rotateImage(direction){


	//These are swapped when rotating

Qqwy / LICENSE.txt

Last active March 8, 2018 11:40 — forked from 140bytes/LICENSE.txt

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

Qqwy / LICENSE.txt

Created October 3, 2013 14:14 — forked from 140bytes/LICENSE.txt

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

Qqwy / Marten Qqwy