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Document BEFORE-ELEM.

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Michael Fogleman 2017-09-11 10:53:28 -04:00
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List-of-Navigators.md
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@ -6,6 +6,7 @@
- [AFTER-ELEM](#after-elem) - [AFTER-ELEM](#after-elem)
- [ALL](#all) - [ALL](#all)
- [ATOM](#atom) - [ATOM](#atom)
- [BEFORE-ELEM](#before-elem)
- [BEGINNING](#beginning) - [BEGINNING](#beginning)
- [DISPENSE](#dispense) - [DISPENSE](#dispense)
- [END](#end) - [END](#end)
@ -104,6 +105,15 @@
2 2
``` ```
## BEFORE-ELEM
`BEFORE-ELEM` navigates to the 'void' element before the sequence. For transformations – if result is not `NONE`, then prepend that value.
```clojure
=> (setval BEFORE-ELEM 3 [1 2])
[3 1 2]
```
## BEGINNING ## BEGINNING
`BEGINNING` navigates to the empty subsequence before the beginning of a collection. Useful with `setval` to add values onto the beginning of a sequence. `BEGINNING` navigates to the empty subsequence before the beginning of a collection. Useful with `setval` to add values onto the beginning of a sequence.