Why console.log() returns undefined?

console.log() is a function. A function must always return some value to the caller. It's a ground rule.

If a return value is not specified, then the function will return undefined*.*

For example, see the below code.

function addOneTo(a) {
    const result = a + 1;
    return result;
}
addOneTo(2);

So, addOneTo the function will return 3 in the console by adding 2+1.

But, if we remove the return statement, it will return undefined.

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