Function scope exists in JavaScript: each function creates a new scope. Outside of the function, variables defined inside the function are not accessible (visible). When declared inside a function, variables declared with var, let, and const are very similar.
Unlike other programming languages like C++ and Java, which have a block level scope defined by, Javascript has a function level scope defined by. In Javascript, scope is lexical; more on that later.
Each function has its own scope, which is commonly referred to as the activation object. The nested function's scope is ordered in a chain, with name lookups flowing up the scope chain from child to parent and the nested function's scope using its surrounding scope as parent.
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