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// JS has 5 data types that are assigned by value:
// `Boolean`, `String`, `Number`, `null`, `undefined` (primitives)
// JS has 3 data types that are assigned by reference:
// `Array`, `Function`, `Object` (objects)

var x = 1, y = '1', z = undefined;

// When we assign these vars to other vars we copy the value to the new var

var a = x, b = y, c = z;

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// Anonymous function:
// Ex.1
(function() {
  // We keep these variables private inside this closure scope
  var myGrades = [93, 95, 88, 0, 55, 91];
  var average = function() {
    var total = myGrades.reduce(function(accumulator, item) {
	  return accumulator + item;
    }, 0);
	return 'Your average grade is ' + total / myGrades.length + '.';

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// `bind` and `this`
let dog = {
  sound: 'woof',
  talk: function() {
    console.log(this.sound);
  }
}

dog.talk(); // => 'woof'

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// In JS `!!` can be used to convert any value to a boolean
// Similar to using the Boolean() function

(function() {
  var foo = 'foo';
  console.log(typeof foo);

  var bool = !!foo;
  console.log(typeof bool);
  console.log(bool);

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SQL

Log into database: mysql [db_name]

View a table: SELECT * FROM table_name;

Update a record in a table:

UPDATE [table_name] SET [table_column] = NOW() WHERE id = 1;

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/**
 * check if vals are objects
 * if so. copy that object (deep copy)
 * else return the value
 */

function deepCopy(obj) {
  const keys = Object.keys(obj);
  const newObject = {};
  for (let i = 0; i < keys.length; i++) {