> Suppose I have some data, and some default values to 
> use in case there is no data:
>       data =. a:,(1;2;3),a:,(3;2)
>       fill =. 10 20 30 40 50 60 70
> The result I want is:
>       10;1;2;3;50;3;2

I prefer the  mask}data,:fill  idiom:

           (10;1;2;3;50;3;2) -: (data=a:)}data ,: <"0 fill 
        1
           
           (10;1;2;3;50;3;2) -: data (a:={.)`]}@:(,: <"0) fill
        1
           
-Dan

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