Hoisting is a behavior in JavaScript where all declarations are moved to the top of the current scope (to the top of the current script or the current function) . This means that variables and functions can be used before they are declared. However, it is important to note that only the declarations are hoisted, not the initializations.
In terms of variables and constants, the var keyword is hoisted, while let and const do not allow hoisting. When using let and const, the block of code is aware of the variable, but it cannot be used until it has been declared.
Function declarations are also hoisted, which means that they can be used before they are declared. However, function expressions are not hoisted and cannot be used before they are declared.
Hoisting can be useful in allowing developers to use functions and variables before they are declared, but it can also lead to bugs if not understood properly. It is important to declare variables and functions at the top of their scope to avoid confusion and unexpected behavior.
