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Further explain paramsfn.

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Chris O'Donnell 2016-06-14 16:46:52 -04:00
parent 35c5129017
commit adef93ecba
1 changed files with 8 additions and 2 deletions
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10
List-of-Macros.md
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@ -282,7 +282,13 @@ Returns an "anonymous navigator." See [defnav](#defnav).
Helper macro for defining filter functions with late binding parameters.
```clojure
=> (let [c-path (comp-paths (paramsfn [val] [x] (< x val)))]
(select [ALL (c-path 5)] [2 7 3 4 10 8]))
;; val is the parameter that will be bound at a later time to complete the navigator
;; x represents the current structure for the navigator
=> (def less-than-n-pred (comp-paths (paramsfn [val] [x] (< x val))))
=> (select [ALL (less-than-n-pred 5)] [2 7 3 4 10 8])
[2 3 4]
=> (select [ALL (less-than-n-pred 9)] [2 7 3 4 10 8])
[2 7 3 4 8]
=> (transform [ALL (less-than-n-pred 9)] inc [2 7 3 4 10 8])
[3 8 4 5 10 9]
```