Is there a particular performance issue that has lead you to ask this question? It's generally good practice to consolidate and minify your js files, but don't

Is there a particular performance issue that has lead you to ask this question? It's generally good practice to consolidate and minify your js files, but don't waste time planning how you do that during your development phases. The reason I ask if you are having performance problems or page loading performance problems is that generally people get hung up this, and often the code files are the least of your worries. Badly created images and many of them can be a killer - try to look at what you can do here first.