Why I am getting undefined in console

Question

const horn = () => {
  console.log("Toot");
};
console.log(horn());

I am getting the output as

Toot undefined

But I can't understand why it is so

Answer 1

Your horn function does not return anything ...

const horn = () => {
  return 'horn';
};
const horn2 = () => {
  console.log('horn');
};
console.log(horn());
horn2();

Answer 2

return

If the value is omitted, undefined is returned instead.

Your function does not return anything. If a function does not return anything then by default undefined is returned.

const horn = () => {
  console.log("Toot");
  return "Toot";
};
console.log(horn());

Answer 3

Because you're function is not returning any values.

const horn = () => {
  console.log("Toot");// <-- problem
};

It should be like this

const horn = () => {
  return "Toot";
};

console.log(horn());

Answer 4

undefined can be remove if you return something in horn() function

const horn = () => {
      return "Toot";
    };
console.log(horn());