Hi again folks Another question around mapping transformatio Pulumi Community #dotnet

Hi again folks! Another question around mapping/tr...

powerful-football-81694

01/16/2020, 6:13 PM

Hi again folks! Another question around mapping/transformation of outputs to inputs: How can I accomplish an

Output.Format()

if my format string is not a string interpolation inline in code, but instead a composite format string (containing

{0}

placeholders) that is fetched from an external source (such as an environment variable)?

powerful-football-81694

01/16/2020, 6:21 PM

If there is just one

Input

I suppose I could call

String.Format()

inside an

.Apply()

on that input.

powerful-football-81694

01/16/2020, 6:22 PM

But in my case there are multiple

Input

that each correspond to a placeholder in the composite format string.

white-balloon-205

01/16/2020, 8:44 PM

Right - the answer is effectively always

.Apply

. And if you have multiple inputs

.All().Apply()

. Other things (like

Output.Format

) are effectively all just sugar for common cases - but if your case falls outside of those - you want

.Apply

and maybe

.All

👍 1

powerful-football-81694

01/16/2020, 8:48 PM

Thanks @white-balloon-205! It’s all slowly beginning to make sense.

tall-librarian-49374

01/16/2020, 8:51 PM

Copy code

var a = Output.Create("a");
var b = Output.Create("b");
var c = "{0}+{1}";
var d = Output.All<string>(a, b).Apply(vs => string.Format(c, vs.ToArray()));

⭐ 1

tall-librarian-49374

01/16/2020, 8:51 PM

Doesn’t look great but should work

powerful-football-81694

01/16/2020, 8:52 PM

Makes perfect sense @tall-librarian-49374 - thanks!

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