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@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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