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week4_day1 - JS - ES6 Basics.html
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<!DOCTYPE html>
<html lang="es">
<head>
<title>JS</title>
<meta charset="utf-8">
</head>
<body>
<h1>JS | ES6 Basics</h1>
<script>
/*
// let, const
// classic var scope
for (var i = 0; i < 3; i++){
// whatever
}
alert(i)
// let block scope
for (let i = 0; i < 3; i++){
// whatever
}
alert(i)
// let block scope
if (true){
let miValor = 'dummy text';
}
alert(miValor)
*/
/*
// truthy - falsy conditionals
function esPar(val) {
if (val % 2 === 0) {
return true
}
}
if (esPar(4)) { // rejects falsy values (null, false, undefined, 0 , ""...)
alert('es par!');
}
*/
/*
// ES6 string methods
const str = "To be, or not to be, that is the question.";
str.startsWith("To be"); // true
str.startsWith("to be"); // false
str.endsWith("question"); // true
str.endsWith("that"); // false
str.includes("To be"); // true
str.includes("To be", 1); // false
*/
/*
// Object deconstruction - also nested!
const bill = {
date: "02/05/2018",
id: 29835,
customer: "Accor Hoteles",
totals: {
subtotal: 1000,
tax: 210
}
}
const {
date,
id,
customer,
totals: { subtotal: invoiceSubtotal }
} = bill;
console.log(customer);
console.log(invoiceSubtotal);
// array deconstruction - with default values also!
let drinks = ['Coca-cola', 'Sprite', 'Cacaolat', 'Rebull']
const [one = 'Pepsi', two = 'Seven Up',,,,,, last = 'Monster'] = drinks
alert(one)
alert(two)
alert(last)
*/
/*
// Array merging without spread operator
let drinksHQ = ['Coca-cola', 'Sprite', 'Cacaolat', 'Rebull']
let drinksLQ = ['Pepsi Max', 'Seven Up', 'Okey', 'Monster']
let allDrinks = []
drinksHQ.forEach(function(drink){
allDrinks.push(drink)
})
drinksLQ.forEach(function(drink){
allDrinks.push(drink)
})
console.log(allDrinks);
// array merging with spread operator
const drinksHQ = ['Coca-cola', 'Sprite', 'Cacaolat', 'Rebull']
const drinksLQ = ['Pepsi Max', 'Seven Up', 'Okey', 'Monster']
const allDrinks = ['Agua', ...drinksLQ, ...drinksHQ]
console.log(allDrinks)
*/
/*
// object arguments
function showNames() {
for (let i = 0; i < arguments.length; i++){
console.log(arguments[i])
}
}
showNames('Germán', 'Isabel', 'Gonzalo')
*/
/*
// rest arguments
function showNames(firstName, ...others) {
alert(firstName)
for (let i = 0; i < others.length; i++){
console.log(others[i])
}
}
showNames('Germán', 'Isabel', 'Gonzalo')
function add(...values) {
return values.reduce((sum, next) => sum + next);
}
const res = add(1, 2, 3, 4, 5)
*/
</script>
</body>
</html>