removeprefix, addprefix, removesuffix, addsuffix with EMPTY input

[Mohammad]

It seems when the input to these operator is empty they still work!!

\define macz(xx, pp:"")
<$list filter="[<__xx__>removeprefix<__pp__>]">
Test: <<currentTiddler>>
</$list>
\end

<<macz xx:"abKIT-1" ab>>

<<macz xx:"abKIT-2" >>

<<macz xx:"abKIT-3" uu>>

Return:

Test: KIT-1

Test: abKIT-2 

Example 2 should return empty value!!

Is this a bug?

--Mohammad

[Jeremy Ruston]

Hi Mohammad

The removeprefix operator has no effect if the operand is blank: [[foo]removeprefix[]] equals "foo". It completely removes items in the input list that do not have the specified prefix.

Best wishes

Jeremy

--

Jeremy Ruston

jer...@jermolene.com

https://jermolene.com

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[Mohammad]

Thanks Jeremy!

 I got it. So the in my example the filter in list has a value and that was why it returned an output.

Cheers

Mohammad