collections.NewScratch

Use the collections.NewScratch function to create a locally scoped persistent data structure for storing and manipulating keyed values. To create a data structure with a different scope, refer to the scope section below.

Methods

Use these methods on the data structure.

Set

Sets the value of the given key.

{{ $s := newScratch }}
{{ $s.Set "greeting" "Hello" }}

Get

(any) Gets the value of the given key.

{{ $s := newScratch }}
{{ $s.Set "greeting" "Hello" }}
{{ $s.Get "greeting" }} → Hello

Add

Adds the given value to existing value(s) of the given key.

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.

{{ $s := newScratch }}
{{ $s.Set "greeting" "Hello" }}
{{ $s.Add "greeting" "Welcome" }}
{{ $s.Get "greeting" }} → HelloWelcome

{{ $s := newScratch }}
{{ $s.Set "total" 3 }}
{{ $s.Add "total" 7 }}
{{ $s.Get "total" }} → 10

{{ $s := newScratch }}
{{ $s.Set "greetings" (slice "Hello") }}
{{ $s.Add "greetings" (slice "Welcome" "Cheers") }}
{{ $s.Get "greetings" }} → [Hello Welcome Cheers]

SetInMap

Takes a key, mapKey and value and adds a map of mapKey and value to the given key.

{{ $s := newScratch }}
{{ $s.SetInMap "greetings" "english" "Hello" }}
{{ $s.SetInMap "greetings" "french" "Bonjour" }}
{{ $s.Get "greetings" }} → map[english:Hello french:Bonjour]

DeleteInMap

Takes a key and mapKey and removes the map of mapKey from the given key.

{{ $s := newScratch }}
{{ $s.SetInMap "greetings" "english" "Hello" }}
{{ $s.SetInMap "greetings" "french" "Bonjour" }}
{{ $s.DeleteInMap "greetings" "english" }}
{{ $s.Get "greetings" }} → map[french:Bonjour]

GetSortedMapValues

([]any) Returns an array of values from key sorted by mapKey.

{{ $s := newScratch }}
{{ $s.SetInMap "greetings" "english" "Hello" }}
{{ $s.SetInMap "greetings" "french" "Bonjour" }}
{{ $s.GetSortedMapValues "greetings" }} → [Hello Bonjour]

Delete

Removes the given key.

{{ $s := newScratch }}
{{ $s.Set "greeting" "Hello" }}
{{ $s.Delete "greeting" }}

Values

(map) Returns the raw backing map. Do not use with Store methods on a Page object due to concurrency issues.

{{ $s := newScratch }}
{{ $s.SetInMap "greetings" "english" "Hello" }}
{{ $s.SetInMap "greetings" "french" "Bonjour" }}

{{ $map := $s.Values }}

Scope

The method or function used to create the data structure determines its scope. For example, use the Store method on a Page object to create a data structure scoped to the page.