It's known that many developers implement various flavors of similar simple languages. What would be nice is to have a library of functions which make implement

It's known that many developers implement various flavors of similar simple languages. What would be nice is to have a library of functions which make implementing such languages much simpler than in C. One of benefits of J language - and other APL descendants - is the set of built-in operations which really simplifies working with structures of such kind, even though it's not the only their purpose.