APL, k, and similar languages are terse. No need for loops, verbose variable/function names, etc. It's far more productive. Plus, since all actions are based o

APL, k, and similar languages are terse. No need for loops, verbose variable/function names, etc. It's far more productive. Plus, since all actions are based on arrays, the compiler can very easily target vector processors (including SSE) and make cache-effecient memory allocations. And since the language is small, the interpreter is usually small enough to fit in L1 cache.