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Installing nvm:

1. curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
2. Restart terminal
3. Install & use latest: nvm install node && nvm use node

Installing python 2:

sudo apt install python-minimal

xemasiv

ZeroMQ vs Redis

This document is research for the selection of a communication platform for robot-net.

Goal

The purpose of this component is to enable rapid, reliable, and elegant communication between the various nodes of the network, including controllers, sensors, and actuators (robot drivers). It will act as the core of robot-net to create a standardized infrastructure for robot control.

Requirements:

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The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

xemasiv

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Jed Schmidt <http://jed.is>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

xemasiv

const ListComponentMap = L => C => M => Ch => (<div>{
    ( typeof L === 'number' ?
    ((L) => {
      let arr = new Array(L);
      for (let k = 0; k < arr.length; k++) (arr[k] = k + 1);
      return arr; })(L)
    : L )
    .map((i, n) =>
      <C key={n} {...typeof M === 'function' ? M(i, n) : M }>
        {typeof Ch === 'function' ? Ch(i, n) : Ch}

xemasiv

Blind / Passive Approach

• Get request IP:
  • HTTP: https://expressjs.com/en/4x/api.html#req.ip
  • WebSocket: https://github.com/socketio/engine.io/blob/49362abcd0c176ed0f8621bc70820a8adf9859b2/lib/socket.js#L33-L38
• Countries and cities dataset:
  • https://dev.maxmind.com/geoip/geoip2/geolite2/
• Reader:
  • https://www.npmjs.com/package/maxmind
• City to coordinates:
  • https://www.npmjs.com/package/all-the-cities

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Summary:

• Backed by Map
  • With .set(), .get(), .has() methods
• Backed by pbf
  • With .toBuffer() and .parseBuffer() methods

References:

• https://www.npmjs.com/package/pbf
• https://docs.microsoft.com/en-us/cpp/c-language/cpp-integer-limits

xemasiv

• https://github.com/mapbox/pbf

  • A low-level, lightweight protocol buffers implementation in JavaScript.

• https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/getCurrentPosition

var options = {
  enableHighAccuracy: true,
  timeout: 5000,
  maximumAge: 0
};

xemasiv

var n = new Notification('Connected', { body: 'Well done mate'} );
setTimeout(() => n.close(), 3000);
Notification.permission;
Notification.requestPermission().then(console.log).catch(console.error);

// https://developer.mozilla.org/en-US/docs/Web/API/notification

xemasiv

// only covers a small subset of the Map api!
// haven't debugged yet!

class BigMap {
  constructor(iterable) {
    if(iterable) throw new Error("haven't implemented construction with iterable yet");
    this._maps = [new Map()];
    this._perMapSizeLimit = 14000000;
    this.size = 0;
  }