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The standard for APL2 is quite old and doesn't reflect the state of commercial APL at all (Dyalog is the only one with significant development now but APLX and
by mlochbaum 4y ago
The standard for APL2 is quite old and doesn't reflect the state of commercial APL at all (Dyalog is the only one with significant development now but APLX and APL+Win kept it going through the 90s). For example, GNU doesn't have control structures so you are expected to program with the branch statement, APL's version of go-to. It also has various extensions of its own, including some that are based on Dyalog but not compatible. It's the only dialect that I would recommend against; I believe April, NARS2000, and dzaima/APL are all better despite various issues.