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/* | |
========================================== | |
Prototypal syntax vs Class syntax | |
========================================== | |
*/ | |
function Poligono(alto, ancho) { | |
this.alto = alto; | |
this.ancho = ancho; | |
} | |
Poligono.prototype.calcArea = function() { | |
return this.alto * this.ancho; | |
} | |
var cuadrado = new Poligono(10, 10); | |
cuadrado.calcArea() // 100 | |
// --------------- Now ----------------- | |
class Poligono { | |
constructor (alto, ancho) { | |
this.alto = alto; | |
this.ancho = ancho; | |
} | |
calcArea () { | |
return this.alto * this.ancho ; | |
} | |
} | |
const cuadrado = new Poligono(10, 10); | |
cuadrado.calcArea(); // 100 | |
/* | |
========================================== | |
Spread parameters | |
========================================== | |
*/ | |
var list = [10, 20]; | |
function calcArea( alto, ancho){ | |
return alto * ancho; | |
} | |
calcArea.apply(null, list); // 200 | |
// --------------- Now ----------------- | |
calcArea(...list); // 200 | |
/* | |
========================================== | |
Default parameters | |
========================================== | |
*/ | |
function calcArea( alto, ancho){ | |
alto = (typeof alto !== 'undefined') ? alto : 10; | |
ancho = (typeof ancho !== 'undefined') ? ancho : 10; | |
return alto * ancho; | |
} | |
// --------------- Now ----------------- | |
function calcArea( alto=10, ancho=10){ | |
return alto * ancho; | |
} | |
/* | |
========================================== | |
`let` hoisting | |
========================================== | |
*/ | |
for (var i = 1; i <= 5; i++){ | |
(function(i){ | |
setTimeout(function() { | |
console.log(i); | |
}, 100*i); | |
})(i); | |
} | |
// --------------- Now ----------------- | |
for (let i = 1; i <= 5; i++){ | |
setTimeout( | |
() => console.log(i), | |
100*i | |
); | |
} | |
/* | |
========================================== | |
fetch vs XMLHttpRequest | |
========================================== | |
*/ | |
var req = new XMLHttpRequest(); | |
req.open( | |
'GET', | |
'https://barranquillajs.com/manifest.json', | |
true | |
); | |
req.onreadystatechange = function (aEvt) { | |
if (req.readyState == 4) { | |
if(req.status == 200) | |
console.log(req.responseText); | |
else | |
console.log("Error loading page\n"); | |
} | |
}; | |
req.send(null); | |
// --------------- Now ----------------- | |
fetch('https://barranquillajs.com/manifest.json') | |
.then(res => res.json()) | |
.then(console.log); | |
// ===================================== |
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