The process of sharing information between JavaScript classes

I'm struggling to grasp the concept of object-oriented JavaScript, particularly in terms of how classes can communicate with each other. Let's consider an example using Babel:

We have a "ColorPalette" class that contains a list of colors
We also have a "Canvas" class that allows you to display a color from the list in ColorPalette

In my main script, I create instances of both classes like this:

const colorPalette = new ColorPalette();
const canvas = new Canvas();

And then I am able to execute commands such as:

canvas.draw(colorPalette.getActiveColor());

So far, so good. I understand how to use getters and setters, and I know how to pass data to methods. Excellent.

However, there are situations where I don't want the main script to handle all the details. For instance, the ColorPalette should always be aware of the most frequently used color on the Canvas. But within the ColorPalette class, I shouldn't need to know or care about the specific instance name of the Canvas class.

In my main script, I could do the following:

colorPalette.setMainColor(canvas.getMainColor());

But I run into issues when trying to achieve the same thing from within the ColorPalette class itself. The class shouldn't rely on knowing the instance name of the Canvas class ("canvas"). I believe my confusion lies in flawed logic here. Any guidance would be greatly appreciated. Thank you for your assistance.

Answer №1

To achieve the goal of decoupling classes from each other, it is essential to implement a design pattern such as MV*, IoC, Observer, or another suitable method depending on the specific requirements.

The MV* pattern is widely used in JavaScript, where a class is responsible for translating user actions into ColorPalette and Canvas methods at its simplest form.

Implementing IoC in JS may be complex, but you can simulate it by creating a constructor in ColorPalette that takes the argument Canvas and stores it as a class variable for extracting necessary data, like the most commonly used color.

For handling events, utilizing Pub-Sub, Observer, or another event-based system can facilitate data transfer between classes while maintaining their independence.

Exploring various patterns is recommended to determine the most appropriate one for your project.

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