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clojurescript 2026-04-27
borkdude 2026-04-27T16:02:34.510769Z
😢
ClojureScript
cljs.user=> (require '[clojure.string :as str])
nil
cljs.user=> (str/replace-first "~{}.prop" "~{}" "$$1")
"$1.prop"Clojure 1.12.1
user=> (require '[clojure.string :as str])
nil
user=> (str/replace-first "~{}.prop" "~{}" "$$1")
"$$1.prop"
is this a bug or a "feature" of javascript maybe?
borkdude 2026-04-27T17:30:17.858889Z
it's not documented in the docstring though. @dnolen thoughts?
Sam Ferrell 2026-04-27T17:36:57.771659Z
maybe it could be changed to pass a function returning the replacement string instead
Sam Ferrell 2026-04-27T21:28:34.168509Z
the implementation of replace-first in CLJS just calls String.replace one of the ways to use the given replacement string literally is to pass a function returning the replacement string instead @nbtheduke but i havent really looked at it for more than a few seconds there may be expectations of the behavior of replace-first that I'm not familiar with
borkdude 2026-04-27T21:29:44.463539Z
I certaintly didn't expect this gotcha, but it's a JS gotcha. With regex you know there's differences between CLJ and CLJS but with a core function like str/replace-first it's less obvious
👍 1
souenzzo 2026-04-27T23:18:06.896519Z
$ node
Welcome to Node.js v25.9.0.
Type ".help" for more information.
> 'axb'.replace('x','$$1')
'a$1b'
> 'axb'.replace('x','$&')
'axb'souenzzo 2026-04-27T23:25:56.359859Z
https://github.com/clojure/clojurescript/blob/v1.12/src/main/cljs/clojure/string.cljs#L98
(.replace s match (.replaceAll replacement "$", "$$$$"))
I think that every replacement should become (.replaceAll replacement "$", "$$$$")
Maybe add a (defn escape-replacement helper?!