Effects aplicados a un proyecto

What are effects in reactive systems?

In the world of reactive web libraries, effects play a crucial role. Systems like React, Vue or Solid use the effects primitive to handle changes and reactions in their internal architectures. But what does an effect really mean in this context? Basically, effects are functions that are executed in response to changes in signals, allowing automatic updates and working in collaboration with other components such as interface rendering. This concept is vital for integrating and keeping the different elements of an application up to date as data changes.

How to create an effect using Solid?

To create an effect, Solid uses the createEffect function, which follows a very clear syntax. The main idea is to set up a function that acts on changes in signals, which we refer to as side effects. These effects depend on reactive variables, called signals. Let's see how to code it:

import { createEffect } from 'PlatziSolids';
createEffect(() => { console.log(count); // 'count' is a signal});

This function ensures that whenever the signal count changes, the function inside createEffect will be executed, logging the modifications that occur.

What is the role of the global context and the stack in Solid?

In Solid, the global context and the stack take an essential role in its reactivity algorithm. This stack system works as a temporary storage that manages the communication between signals and effects. The stack acts as a stack (LIFO - Last In, First Out), where effects and their functions are inserted and executed sequentially.

The way these elements interact is by managing a global context. As effects are executed, they are added to the stack. This approach allows for indirect but efficient communication between signals and effects. This means that each time an effect is executed, the last element inserted in the stack, known as observer, is taken into account.

How does the subscriber list and effect execution work?

When an effect uses a signal, it automatically becomes a subscriber of that signal. This relationship allows that every time the signal changes, all the effects that are listening to it are executed again. This communication is done using a data structure called set, which handles single elements efficiently:

const subscribers = new Set();
subscribers.add(observer);

This set acts as a list of subscribers. When a signal is modified, all subscribers are notified to execute the corresponding functions again, thus allowing the automatic update of states in the application.

How to test the effects in a functional application?

To verify that effects work correctly, we can incorporate them in our applications by simple tests. For example:

createEffect(() => { const element = document.getElementById('count'); element.textContent = countSignal;});

This code block is executed when the signal countSignal changes, automatically updating the content of the DOM element with the id count. In this way, you can see how both the log consoles and the interface changes are automatically synchronized when the signal is modified.

Learning about the effects on reactive systems like Solid not only enriches the knowledge of modern web development, but also prepares developers to enter projects where reactivity is an essential component. Go ahead! Keep exploring and understanding more about these fascinating systems.