[mercury-users] io__foldl

[Nancy Mazur]

> Simple assignments could be: 
> - writing a predicate that returns the number of occurrences of the
>   character 'a' in a string. 
> - writing a predicate that returns the number of digits appearing in a
>   string...

as an extra hint: use either string__first_char to downsize your string
at each step, or use string__to_char_list, and work with the list of
chars... 

have fun, 
Nancy
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