[Jprogramming] Counting characters

[Skip Cave]

Why does this work:
   +/"1'abc'=/'abcbdefbbcbaa'
3 5 2                                   NB. 3 'a's, 5 'b's, and 2 'c's

And this works:

    tst2=. 3 : '+/"1''abc''=/y'

    tst2 'abcbdefbbcbaa'

3 5 2

But this doesn't work:
    ts1 =. +/"1'abc'=/]
    ts1  'abcbdefbbcbaa'
|domain error: ts1

| ts1'abcbdefbbcbaa'


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