delay implementation as long as possible.lhs

even non-executable.

"fix $ map head . scanl (\\) [2..] . map (\p->[p,p+p..])" -- what is (\\)?..

"sv (p:xs) = p : sv (remove (multiplesOf p) xs)" -- what is remove?.. what is multiplesOf?.. 

<< https://twitter.com/yminsky/status/974411177731280896

Yaron Minsky @yminsky  19h19 hours ago
A technique that I think people don't use often enough, and that I don't use often enough:

Write an executable spec.

It's a simple, low-tech technique. Create a freestanding implementation of key subsets of the logic you need to write. >>