javascript variable variables code example

Example 1: var javascript

var is a keyword to define the varible in js but as of es-6 we, use let and const keywords for the same

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