JavaScript: typeof в JavaScript

Пример использования оператора typeof в JavaScript:

const value = 42;
console.log(typeof value); 
// > "number"

const message = "Hello, world!";
console.log(typeof message); 
// > "string"


function multiply(a, b) {
  return a * b;
}

const result = multiply(5, 7);
console.log(typeof multiply); 
// > "function"
console.log(typeof result); 
// > "number"


const user = {
  name: "Alex",
  age: 30,
  isAdmin: true
};

console.log(typeof user); 
// > "object"
console.log(typeof user.name); 
// > "string"
console.log(typeof user.age); 
// > "number"
console.log(typeof user.isAdmin); 
// > "boolean"