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----
-title: in
-description: Checks if an element is in an array or slice--or a substring in a string---and returns a boolean.
-categories: [functions]
-menu:
- docs:
- parent: functions
-keywords: [strings]
-signature: ["in SET ITEM"]
-relatedfuncs: []
----
-
-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.
-
-```go-html-template
-{{ if in .Params.tags "Git" }}Follow me on GitHub!{{ end }}
-```
-
-
-```go-html-template
-{{ if in "this string contains a substring" "substring" }}Substring found!{{ end }}
-```