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124 lines
3 KiB
Markdown
124 lines
3 KiB
Markdown
---
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title: collections.NewScratch
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description: Returns a locally scoped "scratch pad" to store and manipulate data.
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categories: []
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keywords: []
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action:
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aliases: [newScratch]
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related:
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- methods/page/scratch
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- methods/page/store
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- methods/shortcode/scratch
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returnType: maps.Scratch
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signatures: [collections.NewScratch ]
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---
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The `collections.NewScratch` function creates a locally scoped [scratch pad] to store and manipulate data. To create a scratch pad that is attached to a `Page` object, use the [`Scratch`] or [`Store`] method.
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[`Scratch`]: /methods/page/scratch/
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[`Store`]: /methods/page/store/
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[scratch pad]: /getting-started/glossary/#scratch-pad
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## Methods
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###### Set
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Sets the value of a given key.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "greeting" "Hello" }}
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```
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###### Get
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Gets the value of a given key.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "greeting" "Hello" }}
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{{ $s.Get "greeting" }} → Hello
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```
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###### Add
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Adds a given value to existing value(s) of the given key.
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For single values, `Add` accepts values that support Go's `+` operator. If the first `Add` for a key is an array or slice, the following adds will be appended to that list.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "greeting" "Hello" }}
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{{ $s.Add "greeting" "Welcome" }}
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{{ $s.Get "greeting" }} → HelloWelcome
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```
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "total" 3 }}
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{{ $s.Add "total" 7 }}
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{{ $s.Get "total" }} → 10
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```
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "greetings" (slice "Hello") }}
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{{ $s.Add "greetings" (slice "Welcome" "Cheers") }}
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{{ $s.Get "greetings" }} → [Hello Welcome Cheers]
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```
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###### SetInMap
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Takes a `key`, `mapKey` and `value` and adds a map of `mapKey` and `value` to the given `key`.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.SetInMap "greetings" "english" "Hello" }}
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{{ $s.SetInMap "greetings" "french" "Bonjour" }}
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{{ $s.Get "greetings" }} → map[english:Hello french:Bonjour]
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```
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###### DeleteInMap
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Takes a `key` and `mapKey` and removes the map of `mapKey` from the given `key`.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.SetInMap "greetings" "english" "Hello" }}
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{{ $s.SetInMap "greetings" "french" "Bonjour" }}
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{{ $s.DeleteInMap "greetings" "english" }}
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{{ $s.Get "greetings" }} → map[french:Bonjour]
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```
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###### GetSortedMapValues
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Returns an array of values from `key` sorted by `mapKey`.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.SetInMap "greetings" "english" "Hello" }}
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{{ $s.SetInMap "greetings" "french" "Bonjour" }}
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{{ $s.GetSortedMapValues "greetings" }} → [Hello Bonjour]
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```
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###### Delete
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Removes the given key.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.Set "greeting" "Hello" }}
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{{ $s.Delete "greeting" }}
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```
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###### Values
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Returns the raw backing map. Do not use with `Scratch` or `Store` methods on a `Page` object due to concurrency issues.
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```go-html-template
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{{ $s := newScratch }}
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{{ $s.SetInMap "greetings" "english" "Hello" }}
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{{ $s.SetInMap "greetings" "french" "Bonjour" }}
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{{ $map := $s.Values }}
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```
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