https://codeburst.io/javascript-essentials-objects-56373a1a6bfb
In this blog I have found a clear explication for the this in JS
What is This?
I’m literally referring to
thisin JavaScript. This is perhaps the part of JS that confuses people the most.This — a variable created by JavaScript that points to an object.
thisis created when an execution context is created ( i.e running a function )
1. We understand this is an object given to us by JavaScript when a function is run.
2. What determines the object this points to? That depends on how the function is called.
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Implicit Binding — if the function is called with a containing object then this refers to that object. i.e person.greet
When a function is called as a method of an object, that function’sthisargument is set to the object the method is called on.
Into Java 