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mojaray2k

var primaryColors = [
  {color: 'red'},
  {color: 'yellow'},
  {color: 'blue'}
];

// What we want to end up with:
// ["red", "yellow", "blue"]

// sometimes the first argument is call the accumulator

mojaray2k

var numbers = [10, 20, 30];
var sum = 0;

for (var i = 0; i < numbers.length; i++){
  sum += numbers[i];
}

console.log("For loop way: ",sum);
// Results are: "For loop way: " 
// 60

mojaray2k

//events - a super-basic Javascript (publish subscribe) pattern

var events = {
  events: {},
  on: function (eventName, fn) {
    this.events[eventName] = this.events[eventName] || [];
    this.events[eventName].push(fn);
  },
  off: function(eventName, fn) {
    if (this.events[eventName]) {

mojaray2k

The revealing module pattern

One of the major problems with JavaScript is the absence of namespacing. Programs that run in the global scope polluting it with data that comes from both internal application code and dependencies. A popular technique to solve this problem is called the revealing module pattern, and it looks like the following:

const module = (() => {
 const privateFoo = () => {...};

mojaray2k

query FirstNOrgMembers($login: String!, $n: Int!) {
  organization(login: $login) {
    id
    name
    members(first: $n) {
      edges {
        node {
          id
 name

mojaray2k

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h):

• -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)

mojaray2k

MySQL

Getting started:

• http://www.sqlteaching.com/
• https://www.codecademy.com/courses/learn-sql

Related tutorials:

• MySQL-CLI
• Analyzing Business Metrics

mojaray2k

var sayAge = function() {
  console.log(this.age);
}

var me = {
  age: 42
}
sayAge();
window.age = 42;
sayAge();

mojaray2k

var Animal = function(color, name, type) {
  this.color = color;
  this.name = name;
  this.type = type;
}

var zebra = new Animal('black and white', 'Zorro', 'Zebra');

// When the "new" keyword is invoked a new object is created and saved as "this"