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67 lines
2.4 KiB
Markdown
67 lines
2.4 KiB
Markdown
---
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title: Math
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description: Hugo provides six mathematical operators in templates.
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godocref:
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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#tags: [math, operators]
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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toc:
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signature: []
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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draft: false
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aliases: []
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---
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There are 6 basic mathematical operators that can be used in Hugo templates:
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| Function | Description | Example |
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| -------- | ------------------------ | ----------------------------- |
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| `add` | Adds two integers. | `{{add 1 2}}` → 3 |
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| `div` | Divides two integers. | `{{div 6 3}}` → 2 |
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| `mod` | Modulus of two integers. | `{{mod 15 3}}` → 0 |
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| `modBool`| Boolean of modulus of two integers. Evaluates to `true` if = 0. | `{{modBool 15 3}}` → true |
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| `mul` | Multiplies two integers. | `{{mul 2 3}}` → 6 |
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| `sub` | Subtracts two integers. | `{{sub 3 2}}` → 1 |
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## Use `add` with Strings
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You can also use the `add` function with strings. You may like this functionality in many use cases, including creating new variables by combining page- or site-level variables with other strings.
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For example, social media sharing with [Twitter Cards][cards] requires the following `meta` link in your site's `<head>` to display Twitter's ["Summary Card with Large Image"][twtsummary]:
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```html
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<meta name="twitter:image" content="http://yoursite.com/images/my-twitter-image.jpg">
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```
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Let's assume you have an `image` field in the front matter of each of your content files:
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```yaml
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---
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title: My Post
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image: my-post-image.jpg
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---
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```
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You can then concatenate the `image` value (string) with the path to your `images` directory in `static` and leverage a URL-related templating function for increased flexibility:
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{{% code file="partials/head/twitter-card.html" %}}
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```html
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{{$socialimage := add "images/" .Params.image}}
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<meta name="twitter:image" content="{{ $socialimage | absURL }}">
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```
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{{% /code %}}
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{{% note %}}
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The `add` example above makes use of the [`absURL` function](/functions/absurl/). `absURL` and its relative companion `relURL` is the recommended way to construct URLs in Hugo.
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{{% /note %}}
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[cards]: https://dev.twitter.com/cards/overview
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[twtsummary]: https://dev.twitter.com/cards/types/summary-large-image
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