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41 lines
1 KiB
Markdown
41 lines
1 KiB
Markdown
---
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title: merge
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description: "`merge` deep merges two maps and returns the resulting map."
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date: 2019-08-08
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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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keywords: [dictionary]
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signature: ["collections.Merge MAP MAP...", "merge MAP MAP..."]
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workson: []
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hugoversion: "0.56.0"
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relatedfuncs: [dict, append, reflect.IsMap, reflect.IsSlice]
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aliases: []
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---
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Merge creates a copy of the final `MAP` and merges any preceding `MAP` into it in reverse order.
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Key handling is case-insensitive.
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An example merging two maps.
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```go-html-template
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{{ $default_params := dict "color" "blue" "width" "50%" "height" "25%" "icon" "star" }}
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{{ $user_params := dict "color" "red" "icon" "mail" "extra" (dict "duration" 2) }}
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{{ $params := merge $default_params $user_params }}
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```
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Resulting __$params__:
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```
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"color": "red"
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"extra":
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"duration": 2
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"height": "25%"
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"icon": "mail"
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"width": "50%"
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```
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{{% note %}}
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Regardless of depth, merging only applies to maps. For slices, use [append]({{< ref "functions/append" >}})
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{{% /note %}}
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