What are some examples of variable scope in programming?

What are some examples of variable scope in programming?

Variable scope refers to the accessibility of variables in different parts of your code. For example, a variable defined inside a function is not accessible outside of it, which is known as local scope.

Can you give me a specific example in JavaScript?

Sure! In JavaScript, if you declare a variable using let inside a block, like an if statement, it won't be accessible outside that block. For instance:

if (true) {
    let x = 10;
}
console.log(x); // This will throw a ReferenceError

What about global variables?

Global variables are accessible from anywhere in your code. If you declare a variable outside of any function, it becomes global. For example:

let globalVar = 'I am global';
function showGlobal() {
    console.log(globalVar);
}
showGlobal(); // This will log 'I am global'

Are there any best practices for using variable scope?

Yes! It's best to limit the use of global variables to avoid conflicts and unintended behavior. Use local variables whenever possible to keep your code modular and maintainable.