Como verificar o tipo de dados da variável JavaScript
let counter = 120; // counter is a number
console.log(typeof(counter)); // "number"
counter = false; // counter is now a boolean
console.log(typeof(counter)); // "boolean"
counter = "Hi"; // counter is now a string
console.log(typeof(counter)); // "string"Code language: JavaScript (javascript)
Zany Zebra