Variable scope

A variable can either be in the global scope, the function scope, or the block scope.

Functions and branching statements use curly braces ({ and }) to indicate a sequence of instructions.

• Function scope - the variable is accessible anywhere in a function (behavior for var)
• Block scope - the variable is accessible in the nearest enclosing braces (behavior of let and const)
• Global scope - a variable that is declared outside any function or block