Meta Programming
Enabling self-adapting code
Meta-Programming [MP] an art of writing program with an ability to rewrite itself. eval a part of JS since the begin of Time(ES1) is a gimmick for MP.
In JS6 MP can be achieved with
Symbols
Symbols are new primitive types just like Number, String, and Boolean. They are tokens that serves as unique ID's for object properties
Proxies
In a nutshell proxies are used to define custom behavior for fundamental operations
By default, proxies don’t do much – in fact they don’t do anything. If you don’t set any “options”, your proxy will just work as a pass-through to the target object
Reflection
Reflect are build-in non constructable JS-object providing options to self-inspect and manipulate its member attributes and methods