v153 · iterator join
Joining a pipeline
A generator, two helpers, a separator, a string. The interesting part is what happens in between — and how many values the source was asked for to produce it.
Run the pipeline
Result
The source counts every value it is asked for. Laziness is not decoration: with take(6) over a source of a thousand, the counter should read 6, and it does — the helper stops pulling, and join never asks for more than it needs.
the code being run