How to process two lists in parallel?

[Erwan]

Hi everyone,

I'm trying to create several tiddlers which contain two fields coming from two different filters.

Example : given the lists "A B C D" and "a b c d" I would like to obtain 4 tiddlers where each contains the nth value from both lists:

tiddler1 has var1=A var2=a

tiddler2 has var1=B var2=b

tiddler3 has var1=C var2=c

tiddler4 has var1=D var2=d

This is my attempt:

<$button>

create the tiddlers with parallel filters

<$list filter="[prefix[mytid]]">
  <$action-deletetiddler $tiddler=<<currentTiddler>>/>
</$list>
<$list filter="A B C D" variable="v1">
  <$action-createtiddler $basetitle="mytid" v1=<<v1>> />
</$list>
<$list filter="a b c d" variable="v2">
  <$list filter="[prefix[mytid]!has[v2]]" variable="t">
          <$action-setfield $tiddler=<<t>> v2=<<v2>>/>
  </$list>
</$list>
</$button>

My great hopes for this solution to work turned out to be misplaced ;)

Is there a way to achieve this lind of "parallel matching"?

Thanks in advance!

Erwan

[Mark S.]

This will do what you want in the most literal fashion:

<$button>alpha mail

<$list filter="[prefix[mytid]]">

  <$action-deletetiddler $tiddler=<<currentTiddler>>/>

</$list>

<$list filter="A B C D" variable="v1">

<$list filter="[<v1>lowercase[]]" variable="v2">

  <$action-createtiddler $basetitle="mytid" v1=<<v1>> v2=<<v2>> />

</$list>

</$list>

</$button>

[Mark S.]

And here's a version that does it by ordinal position:

<$button>alpha mail

<$list filter="[prefix[mytid]]">

  <$action-deletetiddler $tiddler=<<currentTiddler>>/>

</$list>

<$list filter="[range[4]]" variable="nth">

<$list filter="A B C D +[nth<nth>]" variable="v1">

<$list filter="a b c d +[nth<nth>]" variable="v2">

  <$action-createtiddler $basetitle="mytid" v1=<<v1>> v2=<<v2>> />

</$list>

</$list>

</$list>

</$button>

[Erwan]

Your second solution is exactly what I need, thank you very much Mark!

Erwan