Olaoluwa (Ola) Mustapha OlaoluwaM

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

https://leetcode.com/problems/maximum-subarray/ # Close enough
~~https://leetcode.com/problems/minimum-size-subarray-sum/~~

The Rules of React

All libraries have subtle rules that you have to follow for them to work well. Often these are implied and undocumented rules that you have to learn as you go. This is an attempt to document the rules of React renders. Ideally a type system could enforce it.

What Functions Are "Pure"?

A number of methods in React are assumed to be "pure".

On classes that's the constructor, getDerivedStateFromProps, shouldComponentUpdate and render.

Introduction

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Install BetterDiscord on Linux

This Gist contains simple instructions on how to install, update, and uninstall BetterDiscord on Linux.

For more thorough documentation, take a look at betterdiscordctl's README.

Do NOT submit issues here as I don't check the comments. You should submit them here instead.

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

-E: will describe the underlaying queries of the \ commands (cool for learning!)
-l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

Tabs and Windows

Function	Shortcut
New Tab	`⌘` + `T`
Close Tab or Window	`⌘` + `W` (same as many mac apps)
Go to Tab	`⌘` + `Number Key` (ie: `⌘2` is 2nd tab)
Go to Split Pane by Direction	`⌘` + `Option` + `Arrow Key`
Cycle iTerm Windows	`⌘` + `backtick` (true of all mac apps and works with desktops/mission control)

	const FakeComponent = () => {
	return (
	<AnimatedRoutes exitBeforeEnter initial={false}>
	<RouteTransition exact path="/some-route">
	<NewUsers />
	</RouteTransition>
	<RouteTransition exact path="/yo" >
	<Users />
	</RouteTransition>
	</AnimatedRoutes>

	# vim:fileencoding=utf-8:ft=conf:foldmethod=marker

	#: Fonts {{{

	#: kitty has very powerful font management. You can configure
	#: individual font faces and even specify special fonts for particular
	#: characters.

	font_family JetBrains Mono Medium
	bold_font JetBrains Mono Bold

	/**
	* @summary
	* High-order function that memoizes a function, by creating a scope
	* to store the result of each function call, returning the cached
	* result when the same inputs is given.
	*
	* @description
	* Memoization is an optimization technique used primarily to speed up
	* functions by storing the results of expensive function calls, and returning
	* the cached result when the same inputs occur again.

	echo-server-epoll
	echo-server-poll
	talk
	talk.dSYM