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---
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
```
|
