in.md (718B)
1 ---
2 title: in
3 linktitle:
4 description: Checks if an element is in an array or slice--or a substring in a string---and returns a boolean.
5 date: 2017-02-01
6 publishdate: 2017-02-01
7 lastmod: 2017-02-01
8 categories: [functions]
9 menu:
10 docs:
11 parent: "functions"
12 keywords: [strings]
13 signature: ["in SET ITEM"]
14 workson: []
15 hugoversion:
16 relatedfuncs: []
17 deprecated: false
18 aliases: []
19 ---
20
21 The elements supported are strings, integers and floats, although only float64 will match as expected.
22
23 In addition, `in` can also check if a substring exists in a string.
24
25 ```
26 {{ if in .Params.tags "Git" }}Follow me on GitHub!{{ end }}
27 ```
28
29
30 ```
31 {{ if in "this string contains a substring" "substring" }}Substring found!{{ end }}
32 ```