What are the benefits of using a combination of design patterns in JavaScript?

Currently, I am working on a personal project for learning purposes, which is a simple To-Do List. I am implementing the modular pattern (specifically, the revealing module pattern). The image below showcases my general idea of how I intend to build it.

View an image of how my app looks like

Each module will be in a separate JS file where they take the following form:

var TaskModule = (function () { 

  function someFunction(parameter) {
    tasks = newTasks;
  }

}

The question arises: what if we want to create a separate file with helper functions? It can be tedious to include repeated code in each module like:

var someElement = document.getElementById('id')

For example, I have a helper function as follows:

var someElement = byId('id');

While creating a HelpersModule in the same way as other modules is a solution, it results in calling functions with a prefixed 'HelpersModule', making them no shorter than the original versions like document.getElementById. To avoid this prefix and ensure simplicity when calling helper functions, I designed my HelpersModule as displayed below:

(function(window) {

    window.byId = function (selector, scope) {
      return (scope || document).getElementById(selector);
    };

})(window);

Although this approach works well, creating the HelpersModule in a non-consistent manner compared to other modules raises the question of whether it is a bad practice or completely acceptable. What are your thoughts on creating modules differently?

Answer №1

Start by creating a utility module similar to your HelpersModule:

const HelpersModule = {
  findId: id => document.getElementById(id),
  findTag: tag => Array.from(document.getElementsByTagName(tag))
};

Then, in another part of your code, store the necessary helper functions in a local variable:

// ...
const findId = HelpersModule.findId; // if only 'findId' is required
const targetElement = findId('my-id');
// ...

Alternatively, you can use destructuring:

const { findId } = HelpersModule; // if only 'findId' is needed
const element = findId('my-id');

Or

const { findId, findTag } = HelpersModule; // when both are needed
const specificElement = findId('my-id');
const allSpans = findTag('span');

Answer №2

When considering whether to use document.getElementById('id') or HelpersModule.byId('id') for the same functionality, it's advisable to stick with the former instead of creating a new module. This approach maintains consistency in your module structure and reduces the need to add extra code per module. Creating a separate module along with writing additional lines of code for each module may be unnecessary. Does this address your query effectively?

Edit:

Upon further clarification, I understand that you are contemplating the idea of consolidating all helper methods into a single module for all modules. However, it is generally better practice to keep helper methods within the specific files where they are utilized. If a helper method is only required by one file and serves its purpose exclusively within that context, it should remain in that file. This arrangement simplifies method management and eliminates the need to switch between files to locate specific methods.

It is recommended to confine helper methods to the files that utilize them (i.e., the files that call them), rather than extracting them into a separate module. This approach helps prevent confusion, especially as your files grow in size over time.

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