Hi Mohammad,

the difference between the is and all operators, as you can see in the 
documentation:

https://tiddlywiki.com/#all%20Operator
https://tiddlywiki.com/#is%20Operator

... is, that the is operator takes a selection of titles as input
in your example it's without input, <currentTiddler>is[current] would work, 
[[01]is[current] would return Lec01 No output No output ...
the all operator creates an output, ignores every input. the is operator 
filters an input


Look at the below codes
>
>
>
>    - Case i
>
>   <$list filter="01 02 03">
>   <$set name="xx" filter="[all[current]addprefix[Lec]]"  emptyValue="No 
> output">
>     <<xx>>
>   </$set>  
>   </$list>
>
> Produces:   Lec01 Lec02 Lec03
>
>
>
>    - Case ii
>
>   <$list filter="01 02 03">
>   <$set name="xx" filter="[is[current]addprefix[Lec]]" emptyValue="No 
> output">
>     <<xx>>
>   </$set>  
>   </$list>
>
> Produces:   No output No output No output
>
>
> What is the problem? Isn't it the *all *and *is *operator are the same?
>
> --Mohammad
>

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