Implement valueOf to compare CacheControl objects

[davidbarratt]

It would be really helpful if the CacheControl object implemented a custom valueOf in order to compare CacheControl objects.

Use-case: I'm making a bunch of HTTP requests to various 3rd party servers and combining them into a single response. These requests have various Cache-Control headers, but I'd like my API to respond with the most restrive (i.e. least cachable) of the lot.

For instance, if I have a set like this:

max-age: 600, public
max-age: 300, public

I'd need the second of the two. But if I have a set like this:

private
max-age: 600, public
max-age: 300, public

I would need the first one.

I realize it might be difficult to translate the Cache-Control into a number, but I think it's ok if some options produce the same number (i.e. private could be -1 and immutable could be 100000000 or something). Or perhaps different options have different weights?

[tusbar]

Hey @davidbarratt,

This wouldn’t be a bad idea. I don’t want this repo to hold too many features besides parsing though but this could be light enough.

If you want to take a stab at it, be my guest. :)