Why sometimes the amend/index doesn't work?

Community Support
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1

https://learninghub.kx.com/forums/topic/why-sometimes-the-amend-index-doesnt-work

In below code, a1 doesn’t work. Any ideas why?

 

myObj: (5 7; (`a; `b ; (4 5)));

a3:.[myObj; 1 2 1; {count x}]; // i.e. ((5 7);(a;b;4 1))
a2:.[myObj; 1 2; {count x}]; // i.e. ((5 7);(a;b;2))
a1:.[myObj; 1; {count x}]; // i.e. it doesn’t work
a0:.[myObj; (); {count x}]; // i.e. 2

 

2

It’s because the dot operator always requires a list as the index. 1 2 1, 1 2 and () are lists, 1 is not. It works if you enlist it.

a1:.[myObj; enlist 1; {count x}];