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---
title: math.Counter
description: Increments and returns a global counter.
categories: []
keywords: []
action:
aliases: []
related: []
returnType: uint64
signatures: [math.Counter]
---
The counter is global for both monolingual and multilingual sites, and its initial value for each build is 1.
```go-html-template
{{ warnf "single.html called %d times" math.Counter }}
```
```sh
WARN single.html called 1 times
WARN single.html called 2 times
WARN single.html called 3 times
```
Use this function to:
- Create unique warnings as shown above; the [`warnf`] function suppresses duplicate messages
- Create unique target paths for the `resources.FromString` function where the target path is also the cache key
[`warnf`]: /functions/fmt/warnf/
[`resources.FromString`]: /functions/resources/fromstring/
{{% note %}}
Due to concurrency, the value returned in a given template for a given page will vary from one build to the next. You cannot use this function to assign a static id to each page.
{{% /note %}}
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