What is lexical scope in JavaScript?

What is lexical scope in JavaScript?

Lexical scope refers to the visibility of variables in nested functions. It determines how variable names are resolved.

Can you give me an example of lexical scope?

Sure! Here's a simple example:

function outerFunction() {
    let outerVariable = 'I am outside!';
    function innerFunction() {
        console.log(outerVariable);
    }
    innerFunction();
}
outerFunction();

In this case, innerFunction can access outerVariable because of lexical scope.

What happens if I try to access an outer variable from a nested function?

If you try to access an outer variable from a nested function, it will work as long as the variable is in scope. If it's not, you'll get a reference error.

Are there any exceptions to lexical scope?

In JavaScript, lexical scope is quite strict. However, using eval or with certain global objects can lead to unexpected behavior.