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ELI5: AJAX

This is my attempt to explain AJAX with no JS-specific concepts. Some understanding of C-like syntax and how functions work is needed.

What Is?

AJAX stands for asynchronous JavaScript and XML, but rarely uses XML anymore. The core of AJAX is a request to the server which will not return a value immediately, but call a function with the response later (once it's come over the wire).

ssube

# use UTF8
set -g utf8
set-window-option -g utf8 on

# make tmux display things in 256 colors
#set -g default-terminal "xterm-256color"

# set scrollback history to 10000 (10k)
set -g history-limit 10000

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node "craft-1.yoursite.net" {
  $craft_pkgs = ['java-1.8.0-openjdk', 'java-1.8.0-openjdk-devel']
  $craft_root = '/opt/craft'
  $craft_user = 'craft'
  $craft_jar = "${craft_root}/minecraft.jar"

  $craft_props = '
allow-flight=true
allow-nether=true
difficulty=2

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validateRegister(req.body).then(function(){
  return db.createUser(req.body.name, req.body.email, req.body.password);
}).then(function(newUser){
  console.log(2);
  res.send({state: 'success', name: newUser.name});
}).catch(function(err){
  res.send(500);
});

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function getRandomIntInclusive(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}

function swap(items, firstIndex, secondIndex, transact){
    var temp = items[firstIndex];
    items[firstIndex] = items[secondIndex];
    items[secondIndex] = temp;
    
    initialState.swapLeft = firstIndex;

ssube

// Example interface and implementation
class Filesystem {
  read(filename) {
    throw new Error('Not implemented!');
  }
  
  write(filename, content) {
    throw new Error('Not implemented!');
  }
}

ssube

$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47
$GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39

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function withinRadius(v, r) {
  return v.l < r;
}

function getDistance(playerA, playerB) {
  const x = playerA.position.x - playerB.position.x;
  const y = playerA.position.y - playerB.position.y;
  const l = Math.sqrt((x * x) + (y * y));
  return {x, y, l};
}

ssube

String 
  = t:Token* { return t; }
  
Token 
  = v:Var  { return v; }
  / v:Part { return v; }
  
Var 
  = T_START T_OPEN n:Name T_CLOSE { return {type: "var", name: n}; }
  

ssube

export default class Color {
  /**
   * Default constructor, taking each component as an argument: new Color(128, 0, 255)
   * The opacity (alpha, a) is optional and defaults to 1.0 (100%).
   */
  constructor(r, g, b, a = 1.0) {
    this._r = r;
    this._g = g;
    this._b = b;
    this._a = a;