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

20 Dec 2016

      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

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

Jan von Löwenstein