luciano/specter
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

update README

Browse source
This commit is contained in:
Nathan Marz 2015-05-27 01:05:15 -04:00
parent 6bae041970
commit 228a949ac1
1 changed files with 9 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
README.md
View file

@ -117,7 +117,7 @@ user> (update [ALL (collect-one :b) :a even?]
The update function receives as arguments all the collected values followed by the navigated to value. So in this case `+` receives the value of the :b key followed by the value of the :a key, and the update is performed to :a's value. The update function receives as arguments all the collected values followed by the navigated to value. So in this case `+` receives the value of the :b key followed by the value of the :a key, and the update is performed to :a's value.
The three built-in ways for collecting values are `VAL`, `collect`, and `collect-one`. `VAL` just adds whatever element it's currently on to the value list, while `collect` and `collect-one` take in a selector to navigate to the desired value. `collect` works just like `select` by finding a sequence of values, while `collect-one` expects to only navigate to a single value. The four built-in ways for collecting values are `VAL`, `collect`, `collect-one`, and `putval`. `VAL` just adds whatever element it's currently on to the value list, while `collect` and `collect-one` take in a selector to navigate to the desired value. `collect` works just like `select` by finding a sequence of values, while `collect-one` expects to only navigate to a single value. Finally, `putval` adds an external value into the collected values list.
To make your own selector, implement the `StructurePath` protocol which looks like: To make your own selector, implement the `StructurePath` protocol which looks like:
@ -163,6 +163,14 @@ user> (update [ALL LAST]
{:b 2 :a 0} {:b 2 :a 0}
``` ```
Increment the value for :a key by 10:
```clojure
user> (update [:a (putval 10)]
+
{:a 1 :b 3})
{:b 3 :a 11}
```
Get every number divisible by 3 out of a sequence of sequences: Get every number divisible by 3 out of a sequence of sequences:
```clojure ```clojure
user> (select [ALL ALL #(= 0 (mod % 3))] user> (select [ALL ALL #(= 0 (mod % 3))]