Re: Challenge 5 – Crack the Code

[SJT]

 

dc: .Q.a -1+ “j”$ sqrt %[;3] -[;8] :: / decrypt dc

371 56 20 251 1091 35 683 683 440

 

A sequence of unaries is close to an ideal style in q. According to Arthur Whitney, Ken Iverson considered even infix notation as a sequence of unaries, e.g. 2*3+4 as (2*)(3+)4.

Note how qs apply/index dualism allows us to compose a list in with the unary functions.

Goes without saying that all the iteration is implicit