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Ejemplo del ámbito de las variables let y var
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function varTest() { | |
var x = 31; | |
if (true) { | |
var x = 71; // misma variable! | |
console.log(x); // 71 | |
} | |
console.log(x); // 71 | |
} | |
function letTest() { | |
let x = 31; | |
if (true) { | |
let x = 71; // variable diferente | |
console.log(x); // 71 | |
} | |
console.log(x); // 31 | |
} | |
// Segundo example | |
var a = 5; | |
var b = 10; | |
if (a === 5) { | |
let a = 4; // El alcance es dentro del bloque if | |
var b = 1; // El alcance es dentro de la función | |
console.log(a); // 4 | |
console.log(b); // 1 | |
} | |
console.log(a); // 5 | |
console.log(b); // 1 |
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