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An introduction to STSC's APL compiler

Although many programs can be written efficiently in APL without iteration, some programs absolutely require iteration. A user who needs such a program is practically forced to use a different language. Other programs can be written non-iteratively, but are more clearly expressed with iteration. APL programmers are often forced to sacrifice clarity and simplicity in order to make a program run fast enough to use. Clearly, these aspects of APL programming neither make the language easier to use nor enhance programmer productivity.