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Comments on How to create Factory Functions instead of using Classes

Post

How to create Factory Functions instead of using Classes

+1
−1

Instead of classes, I want to use factory functions.

Original code with classes:

export class MyProject {
    constructor(title, description, dueDate, priority) {
        this.title = title;
        this.description = description;
        this.dueDate = dueDate;
        this.priority = priority;
        this.todos = [];
        this.projectIndex = null;

        this.expandContent = () => expandContent(this);
        this.deleteCard = () => deleteCard(this);
        this.addTodo = (todoText) => {
            this.todos.push(todoText);
            this.expandContent();
        };
    }
}

I tried using factory functions:

export const MyProject = (title, description, dueDate, priority) => {
    let todos = [];
    let projectIndex = null;

    const expandContent = () => expandContent(this);
    const deleteCard = () => deleteCard(this);
    const addTodo = (todoText) => {
        todos.push(todoText);
        expandContent();
    }

    return {title, description, dueDate, priority, todos, projectIndex, expandContent, deleteCard, addTodo}
};

I've acknowledged, that this is not necessary in factories, I'm not really sure how not to use them in expandContent and deleteCard functions

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2 comment threads

When using `class` syntax, you should use it's method syntax as well (1 comment)
Ambiguous (1 comment)
Ambiguous
Derek Elkins‭ wrote about 2 months ago

It's pretty unclear what you want the result to be. What I think is most likely is either 1) you want to explore the old-style way of making "classes" in JavaScript, or 2) you want to explore how OO can be mimicked with higher-order functions without using JavaScript's built-in OO features. Only the latter would not involve using this at all. But you might also just want to know how to define things so that you can say MyProject(...) rather than new MyProject(...). You could also just want to know about the general design pattern of factory functions in JavaScript as Alexei's addition of the design-patterns tag suggests, but I think adding that tag was a mistake on Alexei's part.