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

[Jan von Löwenstein]

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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