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const greenGrocer = {

buyApples: function(quantity) {

return quantity + ' apples';

},

buyTomatoes: function(quantity) {

return quantity + ' tomatoes';

},

buyCauliflower: function(quantity) {

return quantity + ' cauliflower';

},

};

const cheeseShop = {

buyCheese: function(type, weight) {

this.cutCheese(type, weight);

return weight + 'gr ' + type + ' cheese';

},

cutCheese: function(type, weight) {

const stopTime = Date.now() + 100;

while (Date.now() < stopTime);

},

};

const bakery = {

buyBread: function(breadReadyCallback, type, quantity) {

setTimeout(function() {

breadReadyCallback(quantity + ' ' + type);

}, 1000);

},

};

function visitGreengrocer() {

console.log('=== Greengrocer ===');

const beforeBuy = Date.now();

const fruitsAndVegetables = [

greenGrocer.buyApples(2),

greenGrocer.buyTomatoes(2),

greenGrocer.buyCauliflower(1),

];

const timeTaken = (Date.now() - beforeBuy).toFixed(2);

console.log('You bought: ', fruitsAndVegetables);

console.log('This took: ' + timeTaken + 'ms\n');

}

function visitCheeseShop() {

console.log('=== Cheese Shop ===');

const beforeBuy = Date.now();

const cheese = cheeseShop.buyCheese('belegen', 500);

const timeTaken = (Date.now() - beforeBuy).toFixed(2);

console.log('You bought: ' + cheese + '');

console.log('This took: ' + timeTaken + 'ms\n');

}

function visitBakery() {

console.log('=== Bakery ===');

const beforeBuy = Date.now();

const breadReady = function(bread) {

const timeTaken = (Date.now() - beforeBuy).toFixed(2);

console.log('--- Callback from Bakery ---');

console.log('You bought: ' + bread + '');

console.log('This took: ' + timeTaken + 'ms\n');

};

bakery.buyBread(breadReady, 'fijn volkoren', 1);

console.log(`We'll call you back!\n`);

}

visitGreengrocer(); // ?.

visitBakery(); // ?.

visitCheeseShop(); // ?.