On February 2, 2019 7:28:12 AM GMT+01:00, Alex Harsanyi
<alexharsa...@gmail.com> wrote:
>Someone asked recently for help on Reddit[1] with a Racket performance
>issue.
>The problem was they they were constructing a large list by appending
>many
>short lists repeatedly; their code was calling `(set! result (append
>result
>shortList))` in a loop and this was slow (unsurprisingly.)
In addition to the general list-processing advice they were likely given, I
suspect someone coming from Python might appreciate tconc structures. SRFI 117
is one attempt at fleshing this out into a contemporary API. But just classic
tconc and lconc are pretty useful to know and have at your fingertips.
-Thomas
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