What is block scope in JavaScript?

What is block scope in JavaScript?

Block scope in JavaScript refers to the visibility of variables within a block, defined by curly braces {}.

Can you give me an example of block scope?

Sure! In a function or an if statement, variables declared with let or const are only accessible within that block.

What happens if I declare a variable with var inside a block?

Variables declared with var are function-scoped, meaning they are accessible outside the block if declared within a function.

Why should I use let or const instead of var?

Using let or const helps prevent issues related to variable hoisting and scope leakage, making your code cleaner and safer.