Can the identical script be implemented by utilizing two separate JavaScript files?

My knowledge of JavaScript is limited, so I often rely on resources like JavaScript.com and Dynamic Drive for coding. Recently, I came across some scripts that reference two different .js files.

<script type="text/javascript" src="lib/prototype.js">  
</script>
<script type="text/javascript" src="src/aptabs.js">  
</script>

I'm curious to know if it's safe to merge these files together with my external JavaScript, or if there could be compatibility issues preventing them from being combined into a single file.

javascriptexternal

Answer №1

Segregating code based on different functionalities is a common practice. These files could be sourced from various origins. For instance, if there's an update to a prototype and you wish to implement the new features, you can simply switch out the prototype.js file on your server instead of modifying a large file and conducting extensive edits.

UPDATE: Another benefit is that it enhances the browser's ability to cache the individual files. If you're concerned about duplicating a block of code across multiple HTML files, I recommend creating a single snippet on the server side and incorporating it into your HTML files through your preferred method.

Answer №2

It is actually more efficient in terms of performance to keep them both in the same file, depending on the architecture of your website. The goal is to minimize the number of HTTP requests, as each one adds some overhead.

However, it is advisable to postpone this task until the final stages of production. During development, it is simpler to keep everything separate. If you do decide to combine them, it is recommended to use an automated build script to streamline the process.

Answer №3

It seems like the javascript code is not aware of the source it originated from, so there should be no issue with merging it together, but...

Personally, I would advise keeping the scripts separate. This will make it easier to manage versions and updates. Since browsers often cache scripts for repeat visits, the difference between loading one or two scripts isn't significant. However, when updates are made, the client will only need to download half as much. Considering that caching is common, this shouldn't be a major concern.

Therefore, for simplicity's sake, I recommend keeping the scripts in their original states. Especially since you mentioned that you are not very familiar with javascript, this approach is the safest. If something goes wrong, it will be easier to troubleshoot without having to determine if you caused the issue or if it was already present.

Additionally, keeping the scripts separate allows for easier re-ordering. For example, if you are using two scripts that both utilize the same terminology like `$` in jQuery, having them separate provides clarity and avoids conflicts.

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