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---
title: len
description: Returns the length of a string, slice, map, or collection.
categories: [functions]
menu:
docs:
parent: functions
keywords: [length]
signature: ["len INPUT"]
relatedfuncs: []
---
With a string:
```go-html-template
{{ "ab" | len }} → 2
{{ "" | len }} → 0
```
With a slice:
```go-html-template
{{ slice "a" "b" | len }} → 2
{{ slice | len }} → 0
```
With a map:
```go-html-template
{{ dict "a" 1 "b" 2 | len }} → 2
{{ dict | len }} → 0
```
With a collection:
```go-html-template
{{ site.RegularPages | len }} → 42
```
You may also determine the number of pages in a collection with:
```go-html-template
{{ site.RegularPages.Len }} → 42
```
|
