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// Types for the result object with discriminated union
type Success<T> = {
  data: T;
  error: null;
};

type Failure<E> = {
  data: null;
  error: E;
};

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AWS CLI Cheatsheet

http://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html https://www.youtube.com/watch?v=_wiGpBQGCjU

Setup

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Node Snippets

• Sleep
• Blocking Sync function
• CLI Colors
• Run External Command
• Encrypt and Decrypt data
• Parse CLI Args
• Display an Option Select in the Terminal
• Determine how long it takes to load a module

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Manage Multiple Git Accounts

There may come a time when you have to manage multiple git accounts on one machine. For example, if you do work from your personal account/repos, and work from your work account/repos on one machine.

• Create your SSH keys
• Add your SSH keys
• Create an SSH config
• Use custom git config per directory
• Troubleshooting

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Google Search Tips

---

Exact Search

Wrap your search in double quotes

Limit Search by Domain

Prefix your search with site:

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Bash Scripting

---

Shebang

#!/usr/bin/env bash

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Networking

• Commands
• For Virtual Machines
  • Manually Create a Bridge Interface
  • Automate Creation of Bridge Interface
• Sources

---

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Jest Testing Examples

• Common Use Cases
  • Testing a function was called with a specific Object property
  • Testing a function was called with a bound callback
  • Setting props on window.location
  • Working with History
  • Time travel
  • Testing exceptions
• Check if an Object contains multiple keys

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Writing Tests with Jest on Node.js

Installation

npm i --save-dev jest

Configuration

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🚀 🚀 Let's Gear Up for TypeScript 🎉 🎉

TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. Any browser. Any host. Any OS. Open source.

Basic Types

• Boolean

let isDone: boolean = false;