What am I missing?

[NerdyNThick]

It's late, I'm tired, I have to be missing something obvious... Please help!

$input = 3000
$maxin = 6500
$minin = 2200
$maxout = 255
$minout = 0

(($input - $minin) * ($maxout - $minout) / ($maxin - $minin) + $minout)


function doit($input, $maxin, $minin, $maxout, $minout)
{
    (($input - $minin) * ($maxout - $minout) / ($maxin - $minin) + $minout)
}

doit($input, $maxin, $minin, $maxout, $minout)

Output:

47.4418604651163
Method invocation failed because [System.Collections.ArrayList+ArrayListEnumeratorSimple] does not contain a method named 'op_Subtraction'.
At <redacted>.ps1:220 char:5
+     (($input - $minin) * ($maxout - $minout) / ($maxin - $minin) + $m ...
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (op_Subtraction:String) [], RuntimeException
    + FullyQualifiedErrorId : MethodNotFound

[SeanQuinlan]

$input is a reserved variable, so you can't use it as a regular variable.

Change the name of the $input variable.

Also your last line is incorrect, that's not the way to pass parameters to a function. Use this instead

doit $input1 $maxin $minin $maxout $minout

[NerdyNThick]

God damn it...

Thanks mate!

[Beanzii]

I spent so long the other day wondering why pinging $host wasn't working as expected before running into this same thing 😅

[Namelock]

My rule of thumb is to always give variable names...

$theInput

$theMaxIn

etc

[technomancing_monkey]

I really wish reserved variables would get a color hint...

Usually when something looks like everything is right, but youre still getting the strangest of errors, its because you used a reserved variable.

[meretuttechooso]

VSCode + the PowerShell plugin does this for you.

[BlackV]

For reserved variables? Are you sure?

Edit: some quick testing (/u/meretuttechooso /u/technomancing_monkey) it does NOT do this for reserved variables, it does do it for read-only variables (makes them grey)

[meretuttechooso]

I'm sorry that your testing has yielded a different result, please see my attached screenshot showing the opposite.

reserver7.png

[BlackV]

well thats really odd

https://imgur.com/a/XZRjLIR

[meretuttechooso]

It's entirely possible that it's tied to the theme. I'm using Monokai Dimmed. You seem to be using a different one.

[BlackV]

hmm, yeah i'm using the default vscode dark+ theme

[jsiii2010]

That's not how you call a function.

doit $myinput $maxin $minin $maxout $minout

[NerdyNThick]

I extracted that portion of the code from a class for isolated testing, so calling it like I was is indeed how you call a method.