What is scope and hoisting in JavaScript?

What is scope and hoisting in JavaScript?

Scope refers to the accessibility of variables in different parts of your code, while hoisting is JavaScript's behavior of moving declarations to the top.

Can you explain how function scope works?

Function scope means that variables declared within a function are not accessible outside of it. They are local to that function.

What about block scope?

Block scope is created by curly braces {}. Variables declared with let or const inside a block are not accessible outside of it.

How does hoisting affect variable declarations?

Hoisting means that variable declarations are moved to the top of their containing scope. However, only the declarations are hoisted, not the initializations.

Can you give an example of hoisting?

Sure! If you declare a variable with var and try to use it before the declaration, it will be undefined, not an error.