Proxy is used to wrap objects and intercept their behavior. It’s actually an ES6 concept used to define custom behavior for fundamental operations.
A simple example would be creating a proxy around a string property on an object. Let’s say I have an array of strings called names.
In order to serve its purpose as a proxy, it needs to have three elements:
- Target: an object which is virtualised by the Proxie
- Handler: a Placeholder Object containing traps
- Trap: the Methods that give access to the target object
The target, obviously, is the object of which reason the proxy is created.
The traps, which are inside the handlers, constitute the methods that provide property access. Traps make the communication between targets that are both with proxies.
Similar to the purpose of proxies, metaprogramming can modify how a specific set of codes work. Because of this, metaprogramming is often regarded as a magical process. The extent of the modification can vary as long as it is within the bounds of what is expected from the typical action or code.
In order to use other programs as their data, developers can either use available online tools for web scraping or make their own automation platform.
Once the trap is carried out, it will not only affect the following commands. It will also activate starting from the source. This is possible because of reflection.
Metaprogramming is most often referred to as magical programming. It can read, generate, analyze, transform, and modify data while running. It has the capability to manipulate language that is known as the Reflection command or Reflective Metaprogramming. This command has three sub-branches, which are (1) introspection, (2) self-modification, and (3) intercession.
Introspection, staying true to its definition, means looking within or inspecting itself. It is the command used to access the internal properties that contain low-level information of the code. Self-modification, on the other hand, is the ability to modify itself.
- Forwards Intercepted Operations
The proxies and metaprogramming automatically forward trapped traps from handlers to the target. Each of the intercepted traps is handled by corresponding proxies. It does not limit or bar the entire process, even if it is assigned with additional tasks on top of forwarding commands.
The reflect command makes automation possible. The command has a system, a method that allows a seamless transition from one placeholder to another. The presence of both metadata and proxy makes the entire concept easier to understand and to connect.
- Modifying through Mutation
Unlike intercession that is limited at the intersection between the target and receiver, modification changes the behavior of the target according to the needs of the recipient.
As stated above, metaprogramming can modify the behavior of a function to a certain extent.
- Creating Proxy Databases
With the aid of web scraping tools, it is easy for a metaprogramming function to analyze and replicate the data to use as its own. And by using it as its own, it means that the new copy can be part of the software or program’s primary line of defence.
Proxy databases along with SSL certifications and code signing certificates make your software program secure than ever. No amount of effort is ever too much for security measures, especially when acquiring it becomes easier with metaprogramming.
- Extra Layer of Security
With proxies, it is possible to hide commands that are meant for a few people only. Metaprogramming also allows existing data from a program to be under the proxy by reflecting the strings of information. Generally, this is a needed extra layer of protection that avoids security mistakes, especially for businesses.
- Use of Revocable Proxies
Metaprogramming and proxies provide freedom to the developer. It allows them to enhance the software as much as they want but within certain limits. Another method on how they can take advantage of this freedom is by utilizing revocable proxies.
From the name itself, revocable proxies are returned. A target, may it be a native array or even another proxy, wraps with the proxy. The handler will then be an object with properties that will describe the behaviour of the proxy when an operation or command acts on it. Once the revoke command is used, the target and handle will no longer be usable.