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1. C like syntax, but many at a time like APL.
2. Very powerful array indexing.
3. Example: Prime number generation by two distinct algorithm(see APL, A+, J, K, Q'Nial version).

   func primes(n) /* DOCUMENT primes(n) Prime number generation by outer product. */ { return where(2 == (0 == (v = indgen(n))(-,)%v)(sum,)); }

   func sieve(n) /* DOCUMENT sieve(n) Prime number generation by sieve of Eratosthenes. */ { tbl = array(1, n); tbl(1) = 0; for (i = 2; i + i <= n; ++i) { if (tbl(i)) tbl(indgen(i + i : n : i)) = 0; } return where(tbl > 0); }

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