Oddbean

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 @488cf7e2 This is for my #emacslisp port of Transducers though. CL has with-hash-table-iterator which makes this easy, since I can drive the iteration myself and stop when I want, but I don't see an analog in Elisp.

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 @6adcf666 If it's just about exiting early, this is how you can do it in Elisp:

(catch 'stop
  (maphash
   ;; do you stuff here
   ;; exit when you want    
    (throw 'stop retval)
   ht))

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 @488cf7e2 @6adcf666 I usually use cl-loop. It uses maphash inside, but it also allows early return with cl-block ... cl-return-from, and a few other nice things.

And cl-block ... cl-return-from is essentially catch ... throw with an autogenerated exception name and lexical scoping.

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 @488cf7e2 Evil, but plausible.

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 @488cf7e2 This did the trick: https://git.sr.ht/~fosskers/transducers.el/commit/9edd7f76e51f58b231b4524c37c113c7a0d99817#transducers.el-4-15