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+---
+title: len
+description: Returns the length of a string, slice, map, or collection.
+categories: [functions]
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: []
+  returnType: int
+  signatures: [len INPUT]
+relatedFunctions:
+  - len
+  - strings.Count
+  - strings.CountRunes
+  - strings.CountWords
+  - strings.RuneCount
+aliases: [/functions/len]
+---
+
+{{% readfile file="/functions/_common/go-template-functions.md" %}}
+
+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
+```