J: A rational redesign of APL

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  1. Functional, array-oriented.
  2. Belongs to APL family, but uses plain-ASCII characters only.
  3. Supports unique parameter-less "tacit" mode definition of function.
  4. Example: Prime number generation by two distinct algorithm(see APL, A+, K, Q'Nial, yorick version). 

    primes =. [:(#~2:=[:+/0:=|/~)>:&i.

    sieve=. 3 : 0
  r=. y.^0.5
  s=. -.y.{.1
  p=. 0
  while. r>:p=. p+>:(p}.s)i.1 do.
    s=. 0 (<:}.p*>:i.<.y.%p)}s
  end.
  >:s#i.y.
)

  5. References:

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