Toggle debug functionality on the fly

Currently in the process of developing a JavaScript animation library of significant size, I am contemplating adding debugging code to it. A simple check like this could be implemented:

if(myLib.debugger){
   console.warn('warning message');
}

However, running this check multiple times per second could potentially lead to performance issues. The situation would exacerbate with additional checks throughout the code.

I am considering whether it is feasible to enable the debugger onload and modify code from something like this:

//debugger if(!this.name) console.warn('No name provided');

to:

if(!this.name) console.warn('No name provided');

By keeping the code commented when not enabled and uncommented when needed, any potential performance concerns can be mitigated. Is there a way to achieve this using regular expressions on the entire script if loaded through ajax? I am aiming to avoid maintaining two versions of the same code - one for debugging and another without it.

The focus here is on functionality rather than cross-browser compatibility (primarily targeting newer browsers). Nonetheless, achieving this would be highly beneficial if possible.

Any insights or suggestions on this matter would be highly valued.

Answer №1

To easily manage the disabling of the debugger, consider implementing a simple method at the beginning of your script that checks for this condition and replaces it with a mock object if necessary:

if (!myDebugger.enabled) {
    window.console = (function () {
        var newConsole = {};
        var key;

        for (key in window.console) {
            if (typeof window.console[key] === 'function') {
                newConsole[key] = function () {};
            }
        }

        return newConsole;
    }());
}

The performance impact of this solution should be minimal.

Answer №2

In the realm of JavaScript libraries, it is commonly expected by third-party developers to have access to two versions: a production version for efficient functioning without debug information and minimized code. And if debugging is required, then the debug version of the library can be easily pointed to.

For example:

<script src="foo-lib-min.js"></script>
<!-- Use this line for debugging <script src="foo-lib-full.js"></script>-->

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