Victor Konopelko canwe

Archive.org Scanned Book Downloader Bookmarklet

A simple "1-click" javascript approach to downloading a scanned book from archive.org to read at your leisure on the device of your choosing w/out having to manually screenshot every pages of the book by hand. In short it's a glorified "Save Image As..." approach but consolidated down to "1 click". BTW there may be a much better option than this out there - I just built this as an autistic project to see if it would work.

Demo Video

Obligatory Legal/Disclaimer:

By using this script you agree to delete all book files/images after your 1 hour or 14 days is up! I don't support using this script for any other use cases. After all, none of us have ever kept a library book past it's return date, right?

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

Clarify and agree on the scope of the system

User cases (description of sequences of events that, taken together, lead to a system doing something useful)
- Who is going to use it?
- How are they going to use it?

`groupby` and `countby` for python

Python has the standard methods for applying functions over iterables, viz. map, filter, and reduce.

For example, we can use filter to filter some numbers by some criterion:

even = lambda x: x % 2 is 0
odd  = lambda x: not even(x)
data = [1, 2, 3, 4]

	/**
	* Please review the class below and suggest improvements. How would
	* you refactor this class if it would be in a real-life project?
	* There are many problems here, both high-level design mistakes,
	* and low-level implementation bugs. We're interested to see high-level
	* problems first, since they are most critical. The more mistakes
	* you can spot, the better programmer you are.
	*/

	/**

	package com.github.example;

	import android.content.Context;
	import android.graphics.Bitmap;
	import android.net.Uri;
	import android.text.TextUtils;
	import android.util.Log;

	import androidx.annotation.Nullable;
	import androidx.core.content.FileProvider;

	@OptIn(ExperimentalAnimationApi::class)
	@Composable
	fun Heart(modifier: Modifier, horizontalPadding: Int, bottomMargin: Int) {
	val width = LocalConfiguration.current.screenWidthDp
	val height = LocalConfiguration.current.screenHeightDp - bottomMargin

	val yRandom = Random.nextInt(0, height / 2)
	val xRandom = Random.nextInt(horizontalPadding, (width - horizontalPadding))

	val state = remember {

	Leaderboard Using Redis

	http://labs.strava.com/blog/koms-powered-by-redis/
	Strava KOMS, Powered by Redis
	----------------

	http://aimeeault.com/2014/06/22/making-the-most-of-redis-and-sorted-sets/

	For example, what if I only want to see a leaderboard of members who are between the ages of 18 and 49? The Sorted Set contains no information on how old each member is. And I don’t want to maintain a separate Redis Sorted Set for just these users, because that’s kind of redundant, right? You probably don’t want to fetch every single one of the potentially hundreds of thousands of records and filter individually… that’s not very efficient! There’s a couple of ways you could approach this with Redis. One is by way of Lua scripting with use of EVAL (which runs Lua) and ZSCAN (which can be used for matching keys and values by rules, similar to regular expressions).

	def permute(sequence, index=0):
	length = len(sequence)

	if index > length:
	raise StopIteration

	if index == length:
	yield sequence
	else:
	for i in range(index, length):

	def perm(xs) :
	if xs == [] :
	yield []
	for x in xs :
	ys = [y for y in xs if not y==x]
	for p in perm(ys) :
	yield ([x] + p)

	# One liner
	wget --recursive --page-requisites --adjust-extension --span-hosts --convert-links --restrict-file-names=windows --domains yoursite.com --no-parent yoursite.com

	# Explained
	wget \
	--recursive \ # Download the whole site.
	--page-requisites \ # Get all assets/elements (CSS/JS/images).
	--adjust-extension \ # Save files with .html on the end.
	--span-hosts \ # Include necessary assets from offsite as well.
	--convert-links \ # Update links to still work in the static version.