/*
 * Objects: Key / Value Pairs
 *
 * Collection
*/

// {} is an empty literal object
console.log(typeof {}); // -> 'object'

var exampleObj = {
  aKey: 'a value',
  anotherKey: 'another value!'
};

// accessing values through DOT syntax
console.log(exampleObj.aKey);       // -> 'a value'
console.log(exampleObj.anotherKey); // -> 'another value!'


// objects are associative arrays
// the key is associated with the value
var user = {
  firstName: 'Jane',
  lastName: 'Doe'
};


// keys are strings...
// accessing values through ARRAY notation/BRACKET notation
console.log(exampleObj['aKey']);       // -> 'a value'
console.log(exampleObj['anotherKey']); // -> 'another value!'


// adding keys
user.age = 22;
user.petName = 'Jax';
console.log(user); // -> {firstName: 'Jane', lastName: 'Doe', age: 22, petName: 'Jax'}

// deleting keys
delete user.petName;
console.log(user); // -> {firstName: 'Jane', lastName: 'Doe', age: 22}

// get all the keys in an object
var userKeys = Object.keys(user); // -> ['firstName', 'lastName', 'age']

// userKeys.length will give the 'length' of an object


// objects can hold anything
var anything = {
  ayo: 'egad',
  pi: 3.14592,
  no: false,
  yeye: {},
  kk: function() { console.log('kk'); },
  lol: []
};


// looping over an object's keys
for(var properyName in user) {
  console.log('key: ' + properyName, 'value in key: ' + user[properyName]);
  console.log("\n");
}