What is the difference between global and local scope in programming?

What is the difference between global and local scope in programming?

Global scope refers to variables that are accessible from anywhere in the code, while local scope refers to variables that are only accessible within a specific function or block.

Can you give me an example of each?

Sure! A global variable might be defined at the top of your script, while a local variable is defined inside a function. For instance:

let globalVar = 'I am global';

function myFunction() {
    let localVar = 'I am local';
    console.log(globalVar); // Accessible
    console.log(localVar);  // Accessible
}

myFunction();
console.log(localVar); // Error: localVar is not defined

Why is it important to understand the difference?

Understanding the difference helps prevent variable conflicts and bugs in your code, ensuring that functions operate as intended without unintended side effects.

What are some common mistakes related to scope?

Common mistakes include trying to access local variables outside their function, or unintentionally overwriting global variables.