prototypes.md

Prototypes

class	JavaScript classes, introduced in ECMAScript 2015, are primarily syntactical sugar over JavaScript's existing prototype-based inheritance. The class syntax does not introduce a new object-oriented inheritance model to JavaScript.
new	The new operator lets developers create an instance of a user-defined object type or of one of the built-in object types that has a constructor function. The new keyword does the following things: Creates a blank, plain JavaScript object; Links (sets the constructor of) this object to another object; Passes the newly created object from Step 1 as the this context; Returns this if the function doesn't return its own object.
prototype
this	A function's this keyword behaves a little differently in JavaScript compared to other languages. It also has some differences between strict mode and non-strict mode. In most cases, the value of this is determined by how a function is called (runtime binding). It can't be set by assignment during execution, and it may be different each time the function is called. ES5 introduced the bind() method to set the value of a function's this regardless of how it's called, and ES2015 introduced arrow functions which don't provide their own this binding (it retains the this value of the enclosing lexical context).