Lambros Petrou lambrospetrou

Recently found some clowny gist was the top result for 'google takeout multiple tgz', where it was using two bash scripts to extract all the tgz files and then merge them together. Don't do that. Use brace expansion, cat the TGZs, and extract:

$ cat takeout-20201023T123551Z-{001..011}.tgz | tar xzivf -

You don't even need to use brace expansion. Globbing will order the files numerically:

$ cat takeout-20201023T123551Z-*.tgz | tar xzivf -

React recently introduced an experimental profiler API. This page gives instructions on how to use this API in a production release of your app.

Table of Contents

Profiling in production
- Create React App
- Webpack 4

Profiling in production

React DOM automatically supports profiling in development mode for v16.5+, but since profiling adds some small additional overhead it is opt-in for production mode. This gist explains how to opt-in.

CLJS in AWS Lambda Quick Start

Setup

First, a few dependencies:

Leiningen: https://leiningen.org/
Node.js & NPM: https://nodejs.org/
Serverless: https://serverless.com/
An active AWS account: https://aws.amazon.com/

Falsehoods programmers believe about time

This is a compiled list of falsehoods programmers tend to believe about working with time.

Don't re-invent a date time library yourself. If you think you understand everything about time, you're probably doing it wrong.

Falsehoods

There are always 24 hours in a day.
February is always 28 days long.
Any 24-hour period will always begin and end in the same day (or week, or month).

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?

	[Unit]
	Description = Foo HTTP server
	Requires = foo.socket
	After = multi-user.target

	[Service]
	User = www-data
	Group = www-data
	WorkingDirectory = /var/foo
	ExecStart = /var/foo/bin/foo-server

	(set! warn-on-infer true)

	(def ^js wifi (js/require "Wifi"))
	(def ^js http (js/require "http"))

	(def n (atom 0))

	(defn build-response []
	(str
	"<html>"

	<label for="DrawerMenuTrigger" class="OpenMenuButton">OPEN MENU</label>


	<input type="checkbox" id="DrawerMenuTrigger" hidden>
	<aside class="DrawerMenu">

	<div class="MenuContainer">
	<nav class="Menu">
	<h2 class="Menu__Title">Awesome CSS Menu</h2>
	<a href="#">Menu Item 01</a>

	(ns dynamic.test
	(:require [clojure.test :refer :all]))

	;; This example shows how tests can be generated dynamically, by
	;; creating new vars with the correct metadata.

	(defn add-test
	"Add a test to the given namespace. The body of the test is given as
	the thunk test-fn. Useful for adding dynamically generated deftests."
	[name ns test-fn & [metadata]]

	function mapValues(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	result[key] = fn(obj[key], key);
	return result;
	}, {});
	}

	function pick(obj, fn) {
	return Object.keys(obj).reduce((result, key) => {
	if (fn(obj[key])) {