selfawaresoup

How to set up an Rstudio server on Ubuntu

This procedure was tested on Ubuntu 23.04 but should be very similar or identical on other verions.

Note that this will likely not install the latest version of R but the one that is included in the Ubuntu package repository. Installing a newer version can be tricky since the R project doesn't always support all recent releases of major Linux distributions. For most use cases, especially for education, the slightly older version of R will be prefectly fine though.

All commands in this guide need to be run as user root or with sudo.

1 Prepare the machine

EllyLoel

/*
  Made by Elly Loel - https://ellyloel.com/
  With inspiration from:
    - Josh W Comeau - https://courses.joshwcomeau.com/css-for-js/treasure-trove/010-global-styles/
    - Andy Bell - https://piccalil.li/blog/a-modern-css-reset/
    - Adam Argyle - https://unpkg.com/open-props@1.3.16/normalize.min.css / https://codepen.io/argyleink/pen/KKvRORE

  Notes:
    - `:where()` is used to lower specificity for easy overriding.
*/

gaearon

Note:

When this guide is more complete, the plan is to move it into Prepack documentation.
For now I put it out as a gist to gather initial feedback.

A Gentle Introduction to Prepack (Part 1)

If you're building JavaScript apps, you might already be familiar with some tools that compile JavaScript code to equivalent JavaScript code:

• Babel lets you use newer JavaScript language features, and outputs equivalent code that targets older JavaScript engines.

developit

const MODULE_DIR = /(.*([\/\\]node_modules|\.\.)[\/\\](@[^\/\\]+[\/\\])?[^\/\\]+)([\/\\].*)?$/g;

{
	loader: 'babel-loader',
	test: /\.jsx?$/,
	include(filepath) {
		if (filepath.split(/[/\\]/).indexOf('node_modules')===-1) return true;
		let pkg, manifest = path.resolve(filepath.replace(MODULE_DIR, '$1'), 'package.json');
		try { pkg = JSON.parse(fs.readFileSync(manifest)); } catch (e) {}
		return !!(pkg.module || pkg['jsnext:main']);

beeman

# Stop all containers
docker stop `docker ps -qa`

# Remove all containers
docker rm `docker ps -qa`

# Remove all images
docker rmi -f `docker images -qa `

# Remove all volumes

markerikson

[02:06 PM] acemarke: @Steven : a couple other thoughts on the whole NODE_ENV thing. First, per my comments, it really is a Node concept. It's a system environment variable that Node exposes to your application, and apparently the Express web server library popularized using its value to determine whether to do optimizations or not
[02:08 PM] acemarke: Second, because of its use within the Node ecosystem, web-focused libraries also started using it to determine whether to they were being run in a "development" environment vs a "production" environment, with corresponding optimizations. For example, React uses that as the equivalent of a C #ifdef to act as conditional checking for debug logging and perf tracking. If process.env.NODE_ENV is set to "production", all those if clauses will evaluate to false.
Third, in conjunction with a tool like UglifyJS that does minification and removal of dead code blocks, a clause that is surrounded with if(process.env.NODE_ENV !== "development")

paulirish

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Generally, all APIs that synchronously provide layout metrics will trigger forced reflow / layout. Read on for additional cases and details.

Element APIs

Getting box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent

emmajane

JQL Syntax for the Impatient

There are a few JQL syntax bits to get you started:

• AND --- allows you to add qualifiers to a list
• != Thing --- target one thing
• is in (List, Of, Things) --- target a bunch of things (Done, Closed, Resolved) typically
• not in (List, of, Things) --- do not include a bunch of things
• -1w --- relative time. You can also use -1d for day
• "2015/3/15" --- specific dates

kujohn

Port Forwarding in Mavericks

---

Since Mavericks stopped using the deprecated ipfw (as of Mountain Lion), we'll be using pf to allow port forwarding.

####1. anchor file Create an anchor file under /etc/pf.anchors/<anchor file> with your redirection rule like:

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048