th3hunt

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)

th3hunt

FROM node:8-alpine

EXPOSE 3000

ARG NODE_ENV
ENV NODE_ENV $NODE_ENV

RUN apk add --update curl && rm -rf /var/cache/apk/*

RUN mkdir /app

th3hunt

/**
 * Pan
 * ---
 *
 * A collection one-finger Pan gesture recognizers.
 *
 * A pan is an omnidirectional one- or two-finger gesture that expands the field of view.
 * Drag is typically used with pan.
 *
 */

th3hunt

AWS ECS Deploy Permissions

In order to be able to deploy using the scripts provided by npm scripts for AWS ECS make sure your user is part of an IAM Group that has the following inline policy applied to it.

Note: This may not be complete.

{
    "Version": "2012-10-17",
    "Statement": [

th3hunt

What is your folder-structure preference for a large-scale Node.js project?

0: Starting from Rails

This is the reference point. All the other options are based off this.

|-- app
|   |-- controllers
|   |   |-- admin

th3hunt

Clustering: The basics

The trick? pass the file descriptor from a parent process and have the server.listen reuse that descriptor. So multiprocess in their own memory space (but with ENV shared usually)

It does not balance, it leaves it to the kernel.

In the last nodejs > 0.8 there is a cluster module (functional although marked experimental)

• http://nodejs.org/api/cluster.html
• Simple cluster example:

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/**
 * dd (aka dummy data)
 * -------------------
 *  
 * Generate dummy data in the form of a String
 *
 * @param {object} options
 * @param {number} [options.sizeInKB=0] - the size of the String in KB, if specified `sizeInMB` is ignored
 * @param {number} [options.sizeInMB=1] - the size of the String in MB
 * @returns {string} a random string of the specified size

th3hunt

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.

Element

Box metrics

• elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
• elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
• elem.getClientRects(), elem.getBoundingClientRect()

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{
  "private": true,
  // ...
  "#dependencies": "dependencies are the one shipped to the client",
  "dependencies": {
    "babel-polyfill": "^6.7.4",
    "react": "^15.0.0",
    // ...
    "whatwg-fetch": "^0.11.1"
  },

th3hunt

#!/bin/bash
# Hook that runs right after login by loginhook.plist LaunchAgent
# Place in $HOME/.loginhook
# chmod 700 .loginhook

# Ignore "control-C" or any other signals that might try to prevent this script from running
trap '' 1 2 3 6 14 15

# Lock the screen so that password is required again
(sleep 1; exec "/System/Library/CoreServices/Menu Extras/User.menu/Contents/Resources/CGSession" -suspend)