What is it about the array languages? What does it mean to ‘think in arrays’? This blog aims to exhibit what is distinctive about the array languages descended from Iverson Notation, originally developed at Harvard in the 1950s.

We’re not trying here to teach you these languages. We suppose you already know a few languages and are curious about these. We aim to satisfy your curiosity and help you decide whether you want to learn and use array languages. We will explain what we think are the key concepts in the code we show.

The languages shown here are Dyalog APL, J and kdb. You can experiment with APL online at TryAPL.org.

Dan Baronet & Stephen Taylor

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