Yan Wu hermionewy

GROKKING NOTES

I liked the way Grokking the coding interview organized problems into learnable patterns. However, the course is expensive and the majority of the time the problems are copy-pasted from leetcode. As the explanations on leetcode are usually just as good, the course really boils down to being a glorified curated list of leetcode problems.

So below I made a list of leetcode problems that are as close to grokking problems as possible.

Pattern: Sliding Window

Git standards

Git is the democracy of programming: it is the worst tool for version control, except all those other tools that have been tried from time to time. Among other problems, Git’s command names are obtuse (what is a “rebase”?) and non-orthogonal (how is “resetting” different than “checking out”?), and Git generally impedes the creation of an accurate mental model, but without understanding its underlying directed acyclic graph, one can’t move from beginner to intermediate user. Still, it is a necessary tool in every developer’s toolbox, and following good Git practices leads to smoother, more productive development. This guide assumes you already know how to use Git and discusses some of the higher level issues around standards for collaboration.

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A non-exhaustive list of WebGL and WebGPU frameworks and libraries. It is mostly for learning purposes as some of the libraries listed are wip/outdated/not maintained anymore.

Engines and libraries ⚙️

Name	Stars	Last Commit	Description
three.js	![GitHub

ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

	#Load all the libraries needed
	library(sf)
	library(dplyr)
	library(rayrender)
	library(elevatr)
	library(rayshader)
	library(geojsonsf)
	library(raster)

	#To recreate the wapo visualization, we need to visualize a few things in 3D: the buildings,

	# code from https://github.com/gkaramanis/aRtist/blob/main/genuary/2021/2021-3/2021-3.R

	library(ggplot2)
	library(dplyr)
	library(magick)
	library(ggridges)

	# Read in image and convert to grayscale
	img <- image_read(here::here("MRlWzfMH_400x400.jpg")) %>%
	image_convert(colorspace = "gray")

	{
	// http://eslint.org/docs/rules/

	"ecmaFeatures": {
	"binaryLiterals": false, // enable binary literals
	"blockBindings": false, // enable let and const (aka block bindings)
	"defaultParams": false, // enable default function parameters
	"forOf": false, // enable for-of loops
	"generators": false, // enable generators
	"objectLiteralComputedProperties": false, // enable computed object literal property names

	# Terminal Cheat Sheet

	pwd # print working directory
	ls # list files in directory
	cd # change directory
	~ # home directory
	.. # up one directory
	- # previous working directory
	help # get help
	-h # get help

	<!doctype html>
	<html>
	<head>
	<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
	<script type="text/javascript">
	var spData = null;
	function doData(json) {
	spData = json.feed.entry;
	}

	// port from GLSL code base on https://github.com/ashima/webgl-noise/blob/master/src/noise2D.glsl

	//JS SNOISE PORT

	function snoise2d(x, y) {

	var C0 = 0.211324865405187;
	var C1 = -0.577350269189626;
	var C2 = 1.79284291400159;
	var OVER_289 = 1 / 289;