Merge commit 'b9bd35d72e14932fb6588ff62b90cddef0a060fc' as 'docs'

docs/content/en/functions/in.md

@@ -0,0 +1,33 @@
+---
+title: in
+linktitle:
+description: Checks if an element is in an array or slice--or a substring in a string---and returns a boolean.
+godocref:
+date: 2017-02-01
+publishdate: 2017-02-01
+lastmod: 2017-02-01
+categories: [functions]
+menu:
+  docs:
+    parent: "functions"
+keywords: [strings]
+signature: ["in SET ITEM"]
+workson: []
+hugoversion:
+relatedfuncs: []
+deprecated: false
+aliases: []
+---
+
+The elements supported are strings, integers and floats, although only float64 will match as expected.
+
+In addition, `in` can also check if a substring exists in a string.
+
+```
+{{ if in .Params.tags "Git" }}Follow me on GitHub!{{ end }}
+```
+
+
+```
+{{ if in "this string contains a substring" "substring" }}Substring found!{{ end }}
+```