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//Own and enumerable properties
let simpleColors = {
  colorA: 'white',
  colorB: 'black'
};
let natureColors = {
  colorC: 'green',
  colorD: 'yellow'
};

//Example 1
Object.setPrototypeOf(natureColors, simpleColors);
console.log(Object.keys(natureColors)); // => ['colorC', 'colorD']
console.log(natureColors['colorA']);    // => 'white'
console.log(natureColors['colorB']);    // => 'black' 




//Example 2
console.log(Object.values(natureColors)); 
// => ['green', 'yellow']
console.log(Object.entries(natureColors));
// => [ ['colorC', 'green'], ['colorD', 'yellow'] ]


//Example 3
let enumerableKeys = [];
for (let key in natureColors) {
  enumerableKeys.push(key);
}
console.log(enumerableKeys); // => ['colorC', 'colorD', 'colorA', 'colorB']


//Object.values() returns property values

let meals = {
  mealA: 'Breakfast',
  mealB: 'Lunch',
  mealC: 'Dinner'
};

//Example 1
for (let key of Object.keys(meals)) {
  let mealName = meals[key];
  console.log(mealName);
}
// 'Breakfast' 'Lunch' 'Dinner'


//Optimized Example of 1 
for (let mealName of Object.values(meals)) {
  console.log(mealName);
}
// 'Breakfast' 'Lunch' 'Dinner'

//Object.entries() returns pairs of property values and keys

//Example 1
for (let [key, value] of Object.entries(meals)) {
  console.log(key + ':' + value);
}
// 'mealA:Breakfast' 'mealB:Lunch' 'mealC:Dinner'


// create a JavaScript object and export it into a Map

let greetings = {
  morning: 'Good morning',
  midday: 'Good day',
  evening: 'Good evening'
};
//Example 1
let greetingsMap = new Map(Object.entries(greetings));
console.log(greetingsMap.get('morning')); // => 'Good morning'
console.log(greetingsMap.get('midday'));  // => 'Good day'
console.log(greetingsMap.get('evening')); // => 'Good evening'

//Map.prototype.values() is equivalent to Object.values()
//Map.prototype.entries() is equivalent to Object.entries()

//Example 2
console.log([...greetingsMap.values()]);
// => ['Good morning', 'Good day', 'Good evening']
console.log([...greetingsMap.entries()]);
// => [ ['morning', 'Good morning'], ['midday', 'Good day'], 
//      ['evening', 'Good evening'] ]