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specter 2025-11-10
What is the Specter idiom for "remove something at a path if there is something there, but if there is nothing there return the structure as is"? This does what I want
(setval
[:a :b :c]
NONE {:a {:b {:c :foo}}}){:a {:b {}}}
but this doesn't
(setval
[:a :b :c]
NONE {}){:a {:b nil}
Looks good. Thanks!
(setval
[(must :a) (must :b) (must :c)]
NONE
{:a {:b {:c :foo}}})
;; => {:a {:b {}}}
(setval [(must :a) (must :b) (must :c)] NONE {})
;; => {}
Samuel Ludwig 2025-11-10T18:18:17.509029Z
Think I have a string-related edge-case, when using setval and nthpath
(setval [(s/srange 1 2)] ["there"] [1 2 3 4]) ;; => [1 "there" 3 4] ;-- unbracketed "there" results in a char-list
(setval [(s/nthpath 1)] "there" [1 2 3 4]) ;; => [1 "there" 3 4]
(setval [(s/srange 1 2)] "there" "1234");; => "1there34"
(setval [(s/nthpath 1)] "there" "1234") ;; => "1[\"there\"]34"setvaling on an index of a string adds these brackets and quotes, where I'd expect something more similar to srange's result
nathanmarz 2025-11-10T20:30:50.053589Z
nthpath doesn't work on strings currently
nathanmarz 2025-11-10T20:31:02.143699Z
if it did, the code you tried should probably error
nathanmarz 2025-11-10T20:31:14.840479Z
since an index of a string is an individual character
nathanmarz 2025-11-10T20:31:38.542049Z
nthpath shouldn't be able to splice a new string in
Samuel Ludwig 2025-11-10T20:46:27.058019Z
Makes sense, this isn't mission critical for anything I'm working on, I was just being very lazy and trying to use specter to alter a busted character in my REPL :^) I know a number of specter functions/navigators are supposed to work with strings, is there an enumeration of what does/doesn't?
Samuel Ludwig 2025-11-10T20:52:22.090389Z
ahhh the cheat-sheet I appreciate it, I was just staring at the macro/nav lists ⭐