I was wondering something regarding lenses. Should I define a lens such as this: ``` Body.auto<Re...

# http4k

[Razi Kheir]

I was wondering something regarding lenses.
Should I define a lens such as this:

Body.auto<RequestBody>().toLens()

Once as a constant and use it inside of other methods?
Or write it inside of a method?
I guess what i’m asking if it will be recreated every time in the method with no reason :x

[dave]

You can do either - we tend to (inconsistently) define them as constants so they can be reused easily - but TBH I suspect that recreating them every time would have a negligible effect in the grand scheme of things

[Razi Kheir]

I’m a bit anal about performance 😄

[dave]

then measure it and let us know! 😉

[dave]

but yes - sharing the instance is our preferred mechanic

[dave]

and also, the JVM is really good at optimising hot code paths, so you might find that it makes less difference over time

[Razi Kheir]

Sorry dave, I’m so swamped at work I don’t even have time to run these tests, but once things calm down I’ll be using http4k in my personal project and bench mark it and share 😄