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Add recursive navigator example to declarepath.

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This commit is contained in:
Chris O'Donnell 2016-07-28 10:10:12 -04:00
parent 8a848a7734
commit c02e0ce474
1 changed files with 7 additions and 1 deletions
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8
List-of-Macros.md
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@ -277,7 +277,7 @@ factor/cache the path.
`(declarepath name params)`
Declares a new symbol available to be defined as a path. If the path will require parameters, these must be specified here. The path itself must be defined using [providepath](#providepath).
Declares a new symbol available to be defined as a path. If the path will require parameters, these must be specified here. The path itself must be defined using [providepath](#providepath). `declarepath` and `providepath` are great for defining recursive navigators, as seen in the second example below.
```clojure
=> (declarepath SECOND)
@ -286,6 +286,12 @@ Declares a new symbol available to be defined as a path. If the path will requir
1
=> (transform SECOND dec (range 5))
(0 0 2 3 4)
=> (declarepath DEEP-MAP-VALS)
=> (providepath DEEP-MAP-VALS (if-path map? [MAP-VALS DEEP-MAP-VALS] STAY))
=> (select DEEP-MAP-VALS {:a {:b 2} :c {:d 3 :e {:f 4}} :g 5})
[2 3 4 5]
=> (transform DEEP-MAP-VALS inc {:a {:b 2} :c {:d 3 :e {:f 4}} :g 5})
{:a {:b 3}, :c {:d 4, :e {:f 5}}, :g 6}
```