Merge Javascript Files

I recently needed to merge 2 javascript files into one.

I used this: https://www.filesmerge.com/merge-javascript-files

It worked like charm.

As the code were complicated, I didn't think it would work.

It didn't just Merge the files, it also compressed. It was 400+ lines of codes, it got compressed so nicely.

Use case:

Here is one of the use cases. I am only discussing the one I used for. 

When you use blogger or even sometimes Wordpress, can not or don't want to upload HTML, CSS, javascript files. So, you have to merge all in one place, then have to copy it to a page or template.