Motivation

• Have you ever tried to loop through an object using for...of ?
• Have you ever needed to traverse a nested object or any abnormal data structure?

Here are some examples of common pitfalls:

Lets simply start by showing some simple examples:

Function Declarations

A function declaration is simply a statement that starts with the word function .

• Line 1 is a function declaration because it starts with the keyword function .
• It is important to remember a function declaration is a Declaration therefore, the code inside will not execute until it is actually invoked.
• Line 13 is us actually invoking the function declaration and executing the code stored inside.

Function Expressions

A function expression is simply a function that does not start with the word function .

• In JavaScript functions are first class objects, meaning they…

Lexical Scope — The scope of a name binding — an association of a name to an entity, such as a variable — is the region of a computer program where the binding is valid

Scope

Scope Simply determines the visibility of variables through a certain set of rules which are set in place and change depending on the Language you are programming in — Thats it, not too complicated!

Lexical Scope

Lexical Scope, is a type of scope — Sometimes also referred to as Static Scope. Lexical Scoping simply defines how variable names are resolved in nested functions e.g …

In Computer Programming, the scope of a name binding — an association of a name to an entity, such as a variable — is the region of a computer program where the binding is valid:where the name can be used to refer to the entity. Such a region is referred to as a scope block.

So, the above definition may be a little hard to depict, so lets examine what that means in reference to python and its own Scope

There are four Scopes in Python:

1. Local — Inside the current function 2. Enclosing — Inside enclosing functions 3. Global — At the top level…