js var
var a;
console.log(a); // scrive in console "undefined" o "" a seconda del browser usato.
console.log('still going...'); // scrive in console "still going...".js var
var a;
console.log(a); // scrive in console "undefined" o "" a seconda del browser usato.
console.log('still going...'); // scrive in console "still going...".js var
var x = y, y = 'A';
console.log(x + y); // non definitohow to declare variables javascript
//variables are a way to easily store data in javascript
//variables are declared by the var keyword, example...
var x = 10;
//or
var dog_name = "daisy";
//which can also be written as
var dog_name = 'daisy';
//same thing with single quotes and double quotesjs variables
// 3 ways to create
var mrVariable = 'x'; // You can set it to to a string ( '' ) or no. ( 0 ). It
// is globally defined
let myVariaible2 = 'y'; // You can set it to string or no. let is block scoped
const myVariable = 'z'; // It is block scoped, can be a string or no. and can't
//be reassignedjs var
function x() {
y = 1; // Genera un ReferenceError in strict mode
var z = 2;
}
x();
console.log(y); // scrive "1" in console
console.log(z); // Genera un ReferenceError: z non è definita fuori dalla funzione xjs var
var nomevariabile1 [= valore1] [, nomevariabile2 [= valore2] ... [, nomevariabileN [= valoreN]]];Copyright © 2021 Codeinu
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