Is Underscore Prefix in JavaScript Just a Style Choice?

Is JavaScript's Underscore Prefix Simply a Matter of Style?

In certain programming languages, such as Python, the underscore prefix holds significance for private class methods and variables. However, in JavaScript, is this prefix merely a convention?

Convention or Mechanism?

Unlike Python, JavaScript does not assign any specific meaning to identifiers beginning with underscores. It is solely a convention adopted by developers to signify private or non-public elements within classes.

Consider the following JavaScript code:

function AltTabPopup() {
    this._init();
}

AltTabPopup.prototype = {
    _init : function() {
        ...
    }
}

Here, the underscore prefix on "_init" method indicates that it should not be called directly from outside the class. Additionally, variables such as "_currentApp" and "_currentWindow" are also prefixed with underscores to convey their internal nature.

Significance and Benefits

While the underscore prefix lacks intrinsic enforcement, it serves as a visual cue to discourage access to sensitive or implementation details. By adhering to this convention, developers can:

• Establish clear boundaries around internal implementation
• Protect classes from misuse
• Enhance code readability and maintainability

Conclusion

While the underscore prefix in JavaScript does not carry the same weight as in languages like Python, it remains a widely accepted convention that fosters best practices in object-oriented design. By using it, developers can clarify their intentions and help prevent unintended access to private members within classes.

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