What is function scope in JavaScript?

What is function scope in JavaScript?

Function scope in JavaScript refers to the accessibility of variables within a function. Variables defined inside a function are not accessible outside of it.

Can you give me an example of function scope?

Sure! Here's a simple example:

function myFunction() {
    var x = 10; // x is only accessible within myFunction
    console.log(x);
}
myFunction(); // Outputs: 10
console.log(x); // ReferenceError: x is not defined

What happens if I declare a variable without var, let, or const?

If you declare a variable without using var, let, or const, it becomes a global variable, which can lead to unexpected behavior.

How does function scope differ from block scope?

Function scope allows variables to be accessible only within the function, while block scope (introduced with let and const) restricts access to the block in which they are defined.