C1. Functions

1. JavaScript Functions:

   1. Function declaration

   2. Function expression

   3. IIFE expression

2. Function parameters and arguments:

   1. Function parameters extensions in ES6

   2. arguments object

3. Function invocation:

   1. Arrow functions

   2. Method invocation

   3. Bound function

   4. Functional closure

   5. Tail calls optimization in ES6

4. Function object:

5. Function constructor

6. Callable entities