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Add params-reset description and examples.

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This commit is contained in:
Christopher O'Donnell 2016-06-12 12:00:44 -04:00
parent 7281ce94de
commit d0cece8bf5
1 changed files with 18 additions and 1 deletions
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19
List-of-Navigators.md
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@ -458,7 +458,24 @@ navigated at the structure.
`(params-reset params-path)`
Not sure. Figure this one out later.
Resets the index in the parameter list to 0. Useful for defining recursive navigators.
```clojure
=> (let [k-path (comp-paths must (params-reset must))]
(select-one (k-path :a) {:a {:a 0}}))
0
=> (let [k-path (comp-paths must (params-reset must) must)]
(select-one (k-path :a :b) {:a {:a {:b 1}}}))
1
;; A recursive navigator that iteratively navigates to a passed in key
=> (declarepath MyWalker [k])
=> (providepath MyWalker
(stay-then-continue must (params-reset MyWalker)))
=> (select (MyWalker :a) {:a {:a {:b 2}}})
({:a {:a {:b 2}}} {:a {:b 2}} {:b 2})
=> (select (MyWalker :a) {:a {:b {:a 0}}})
({:a {:b {:a 0}}} {:b {:a 0}})
```
### parser