A function is a parametric block of code defined once and called multiple times later. In JavaScript a function is composed and influenced by many components:

• JavaScript code that forms the function body
• The list of parameters
• The variables accessible from the lexical scope
• The returned value
• The context this when the function is invoked
• Named or an anonymous function
• The variable that holds the function object
• arguments object (or missing in an arrow function)

This post teaches you six approaches to declare JavaScript functions: the syntax, examples and common pitfalls. Moreover, you will understand when to use a specific function type in certain circumstances.

#javascript #programming