Multi-dimensional arrays provide all sorts of data structures, but modern APLs have also have namespaces/dictionaries, classes with inheritance, etc. Oh, and AP

Multi-dimensional arrays provide all sorts of data structures, but modern APLs have also have namespaces/dictionaries, classes with inheritance, etc. Oh, and APL has had exception/error handling since the ’60s, with today’s APLs having rather flexible systems for this.