[Haskell-beginners] Lens and imperative programming

Giacomo Tesio giacomo at tesio.it
Fri May 24 18:41:27 CEST 2013

For example I'm scared by += a function compositions.

For example here

units.traversed.health -= 3

I've some difficult to grasp the type. I can calculate it (or ask ghci :-D)
, but it looks complex to grasp.

May be I'm just too new to Haskell tools... but... I fear that in the long
run, this could become unreadable.

Am I wrong?


On Fri, May 24, 2013 at 5:10 PM, Kim-Ee Yeoh <ky3 at atamo.com> wrote:

> On Fri, May 24, 2013 at 9:15 PM, Giacomo Tesio <giacomo at tesio.it> wrote:
>> I know the limits of imperative programming, and despite the fact that
>> lens are purely functional by themself, I'm scared about limits in
>> readability of code. I'm afraid of writing "write-only" code.
> Without any example or further details about the exact nature of this
> fear, I think it's really difficult for anyone to do this question justice.
> As a start, try divvying up the issue into syntax and semantics.
> Semantically, lenses remain purely functional, as you say. Syntax-wise, it
> appears problematic. One path forward is to flesh out what you mean by the
> latter.
> -- Kim-Ee
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