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Braking

Standard Braking Distance

• DE: (Geschwindigkeit / 10) * (Geschwindigkeit / 10)
• EN: (Speed / 10) * (Speed / 10)

Evasive (Emergency) Braking Distance

• DE: ((Geschwindigkeit / 10) * (Geschwindigkeit / 10)) / 2
• EN: ((Speed / 10) * (Speed / 10)) / 2

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While driving on the motorway you overtake several vehicles. A vehicle approaches you from behind with indicators and headlights flashing. What should you do?

• I brake briefly to prompt the vehicle behind to keep its distance
• I continue driving until I can again pull into the right-hand lane
• I turn on my hazard lights briefly to urge the vehicle behind to keep its distance

When must you switch on the hazard lights on your vehicle? If my vehicle

• is being towed
• experiences a breakdown at a place where the view is obscured
• is briefly double-parked by me

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// 1. Even or odd

function isEven(value){
  if (value % 2 == 0){
    return true;
  }
  else
    return false;
}

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// Ensure CSS grid works with IE 11 spec.
// https://css-tricks.com/browser-compatibility-css-grid-layouts-simple-sass-mixins/
// sass-lint:disable no-vendor-prefixes, no-duplicate-properties
@mixin display-grid {
  display: -ms-grid;
  display: grid;
}

// $columns values should be delimited by a space
@mixin grid-template-columns($columns...) {

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// ----
// Sass (v3.3.4)
// Compass (v1.0.0.alpha.18)
// ----

// Capitalize string
// --------------------------------------------------------------------------------
// @param [string] $string
// --------------------------------------------------------------------------------
// @return [string]

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Storybook Docs w/ CRA & TypeScript

This is a quick-and-dirty walkthrough to set up a fresh project with Storybook Docs, Create React App, and TypeScript. If you're looking for a tutorial, please see Design Systems for Developers, which goes into much more depth but does not use Typescript.

The purpose of this walkthrough is a streamlined Typescript / Docs setup that works out of the box, since there are countless permutations and variables which can influence docs features, such as source code display, docgen, and props tables.

Step 1: Initialize CRA w/ TS

npx create-react-app cra-ts --template typescript

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Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

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//App structure:
// app_folder/
//   webpack.config.js
//   /server/
//      server.js
//   /src/
//      index.js

// How to run: from root folder run command: "node server/server"

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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)

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ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/id_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/github_rsa
ssh-keygen -t rsa -b 4096 -N '' -C "rthijssen@gmail.com" -f ~/.ssh/mozilla_rsa