Use of Constant and Let

fruits.js

// this has to be today's date.
const dateToday = '12-11-2016';

fetch('http://opencanvas.co.uk/ocl/api/fruits?date=' + dateToday)
.then(function(res) {
    return res.json();
})
.then(function(json) {
	const fruits = json.fruits;
	for (let index in fruits) {
		console.log(fruits[index]);
	}
});