var variable javascript code example

Example 1: javascript declare a variable

//choose the best for your solution
var myVariable = 22; //this can be a string or number. var is globally defined

let myVariable = 22; //this can be a string or number. let is block scoped

const myVariable = 22; //this can be a string or number. const is block scoped and can't be reassigned

Example 2: js 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 x