3 ms·us←{'_'@{¯1⌽⍵⍷⍨(⊂⊃K),'*'}⍵}by geocar 5y agous←{'_'@{¯1⌽⍵⍷⍨(⊂⊃K),'*'}⍵}rak1507 5y agoAh, ⍷, clever, don't even need the outer {...⍵}, us←'_'@{¯1⌽⍵⍷⍨(⊂⊃K),'*'}geocar 5y agoYes! You could also do: ⌽'*',⊂⊃K to save another character. I don't know if that's "better" though.rak1507 5y agoOr alternatively '*',⍨⊂⊃K which I think I prefer over ⌽, but neither seem that 'better' in my mind anyway.