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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