Merge commit 'e509cac533600cf4fa8382c9cdab78ddd82db688'

docs/content/en/functions/collections/In.md

@@ -0,0 +1,38 @@
+---
+title: collections.In
+linkTitle: in
+description: Reports whether an element is in an array or slice, or if a substring is in a string.
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: [in]
+  returnType: bool
+  signatures: [collections.In SET ITEM]
+relatedFunctions:
+  - collections.Slice
+aliases: [/functions/in]
+---
+
+
+
+```go-html-template
+{{ $s := slice "a" "b" "c" }}
+{{ in $s "b" }} → true
+```
+
+```go-html-template
+{{ $s := slice 1 2 3 }}
+{{ in $s 2 }} → true
+```
+
+```go-html-template
+{{ $s := slice 1.11 2.22 3.33 }}
+{{ in $s 2.22 }} → true
+```
+
+```go-html-template
+{{ $s := "abc" }}
+{{ in $s "b" }} → true
+```