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| .Scratch | Acts as a "scratchpad" to allow for writable page- or shortcode-scoped variables. | 2017-02-01 | 2017-02-01 | 2017-02-01 |
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In most cases you can do okay without Scratch, but due to scoping issues, there are many use cases that aren't solvable in Go Templates without Scratch's help.
{{% note %}} See this Go issue for the main motivation behind Scratch. {{% /note %}}
{{% note %}}
For a detailed analysis of .Scratch and in context use cases, see this post.
{{% /note %}}
Methods
Scratch is added to both Page and Shortcode -- with following methods:
.Set
Set the given value to a given key
{{ .Scratch.Set "greeting" "Hello" }}
.Get
Get the value of a given key
{{ .Scratch.Set "greeting" "Hello" }}
----
{{ .Scratch.Get "greeting" }} > Hello
.Add
Will add a given value to existing value 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.
{{ .Scratch.Add "greetings" "Hello" }}
{{ .Scratch.Add "greetings" "Welcome" }}
----
{{ .Scratch.Get "greetings" }} > HelloWelcome
{{ .Scratch.Add "total" 3 }}
{{ .Scratch.Add "total" 7 }}
----
{{ .Scratch.Get "total" }} > 10
{{ .Scratch.Add "greetings" (slice "Hello") }}
{{ .Scratch.Add "greetings" (slice "Welcome" "Cheers") }}
----
{{ .Scratch.Get "greetings" }} > []interface {}{"Hello", "Welcome", "Cheers"}
.SetInMap
Takes a key, mapKey and value and add a map of mapKey and value to the given key.
{{ .Scratch.SetInMap "greetings" "english" "Hello" }}
{{ .Scratch.SetInMap "greetings" "french" "Bonjour" }}
----
{{ .Scratch.Get "greetings" }} > map[french:Bonjour english:Hello]
.GetSortedMapValues
Returns array of values from key sorted by mapKey
{{ .Scratch.SetInMap "greetings" "english" "Hello" }}
{{ .Scratch.SetInMap "greetings" "french" "Bonjour" }}
----
{{ .Scratch.GetSortedMapValues "greetings" }} > [Hello Bonjour]
.Delete
Removes the given key
{{ .Scratch.Delete "greetings" }}
Scope
The scope of the backing data is global for the given Page or Shortcode, and spans partial and shortcode includes.
Note that .Scratch from a shortcode will return the shortcode's Scratch, which in most cases is what you want. If you want to store it in the page scoped Scratch, then use .Page.Scratch.