From c660e30a7dd781f71bed050b20c3e2d0b069e063 Mon Sep 17 00:00:00 2001
From: Jesper Louis Andersen <jesper.louis.andersen@gmail.com>
Date: Sat, 9 Apr 2016 17:17:59 +0200
Subject: Implement lists:join/2

Add a call which works much like string:join/2 but for arbitrary lists. Provide
the function itself, lifted from Haskells Data.List standard library, provide
documentation and provide tests for the function.
---
 lib/stdlib/doc/src/lists.xml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'lib/stdlib/doc')

diff --git a/lib/stdlib/doc/src/lists.xml b/lib/stdlib/doc/src/lists.xml
index 89ba5238b5..84e9615e4f 100644
--- a/lib/stdlib/doc/src/lists.xml
+++ b/lib/stdlib/doc/src/lists.xml
@@ -261,6 +261,21 @@ flatmap(Fun, List1) ->
           preferred to <c>foldr/3</c>.</p>
       </desc>
     </func>
+    <func>
+      <name name="join" arity="2"/>
+      <fsummary>Insert an element between elements in a list</fsummary>
+      <desc>
+        <p>Inserts <c><anno>Sep</anno></c> between each element in <c><anno>List1</anno></c>. Has no
+          effect on the empty list and on a singleton list. For example:</p>
+        <pre>
+> <input>lists:join(x, [a,b,c]).</input>
+[a,x,b,x,c]
+> <input>lists:join(x, [a]).</input>
+[a]
+> <input>lists:join(x, []).</input>
+[]</pre>
+      </desc>
+    </func>
     <func>
       <name name="foreach" arity="2"/>
       <fsummary>Apply a function to each element of a list</fsummary>
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