[Haskell-cafe] Lenses: Changing/creating values deep inside JSON or HashMap

[Benjamin Edwards]

If the desired function doesn't inspect the input then why not just use
const <<thing you want>> ?

As to the lenses part: If you use a prism and it doesn't match, then it's a
noop.

On Tue, 20 Dec 2016 at 09:38 Jan von Löwenstein <jan.loewenstein at gmail.com>
wrote:

> Hi,
>
> I want to have code that produces the following result no matter if input
> A or B was given:
>
> Result:
> {
>   "outer" : {
>                   "inner" : "new-value"
>                 }
> }
>
> A:
> {
>   "outer" : {
>                   "inner" : "old-value"
>                 }
> }
>
> B:
> {}
>
> `json & key "outer"._Object.key "inner" .~ "new-value"` didn't work.
>
> Is what I want even possible with lenses?
>
> Best
> Jan
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