@huthayfa.ainqawi it'll be easier to help you if you give an example of the input and output you want

@nathanmarz input {"properties": { "assets": {"target-key"}}} output: [properties assets target-key]

input ({"properties": { "assets": {"target-key"}}}, target-key) output: [properties assets target-key]

@huthayfa.ainqawi that input isn't well formed

input ({"properties": { "assets": {"target-key" "value"}}}, target-key) nested map

Hi, how do you navigate data structures with specter lazily? What I'm trying to do is select the first item with matching predicate like this:

(->> very-long-vector
     (transform [ALL] my-fn)
     (select-first [ALL my-pred?]))

@funyako.funyao156 there is no lazy computation with specter

but if you do (select-first [ALL (view my-fn) my-pred?] very-long-vector) it will stop traversing the vector as soon as my-pred? is satisfied

@nathanmarz so the select-first behave similar to (first (filter pred ...)) in terms of "lazy like" ? Thanks!

@funyako.funyao156 it works via early termination

it uses reduced/`reduced?` under the hood

@nathanmarz Thanks alot for answering me! Last one, sorry if I ask a lot. How do you return default value using select-first if no matching element found, for example:

(select-first [ALL keyword? (nil->val :foo/bar)] [1 2 3])

that code never gets to the nil->val navigator since keyword? filters everything out

you can just do (or (select-first [ALL keyword?] [1 2 3]) :foo/bar)

Right, silly me. Sorry I ask alot! Thanks again!

no problem, that's what this channel is for

@huthayfa.ainqawi

user=> (def MAP-VALS+ (path ALL (collect-one FIRST) LAST))
#'user/MAP-VALS+
user=> (select-any [MAP-VALS+ MAP-VALS+ MAP-KEYS] {"properties" { "assets" {"target-key" "value"}}})
["properties" "assets" "target-key"]