Iterate
Plugin: Logic | Mode: Run
Create a for loop to iterate over an array, a Collection, objects or strings.
Each time an Iterate action is called, the next element in a set of elements is made available.
Use the action inside a Loop to create For Each Loops.
Settings
with
Array, collection or object to be iterated over.
If you specify an integer for with, the number range from 0 to the specified number is iterated.
Variable name
Name of the variable that designates the current element.
Next State
Next state in which the current element is to be used.
Repeat
If this option is activated, the first element is restarted at the end of the previous iteration. The iteration is endless unless it is interrupted externally. If not activated, the following action is triggered in the state.
Reverse order
If this option is activated, the sequence is reversed from the last to the first element.
Variables
loop
type: Integer
Number of loops iterated so far from 1 to n. loop can only exceed 1 if repeat is selected.
index
type: integer
Contains the current value of the iteration.
Examples
Array
An array can either be defined in advance, e.g. via the action set variable or directly in the with field:
Now each location can be output one after the other:
The log message shows a different value for each run. When the loop is finished, the next action is triggered in the iterate state and the level is ended.
String
You can also define a string to be iterated over. The following example iterates over the letters of the alphabet:
Number
Enter an integer for width to perform a number of iterations.
In this case, the value of the element is the number of the iteration and corresponds to the index action variable +1.
Object
When you iterate over an object, the element of each iteration is the next one of the key: value pairs. You can access the property name within the iteration with element.key and the corresponding value with element.value.
Collection
A special feature of the iterate action is that it can also be iterated over entire collections.
Given the collection MEDIA, which contains a collection of media files. It has the following entries:
The path attribute contains information about where the file is stored. See Files and Media Files to learn more about this topic.
The type attribute can be either talk or atmo and the ID defines the order in which the files are to be played. The iterate action can now be used in the following way:
For pragmatic reasons, we use the JSON notation of the level from here on and no longer the screenshots. The JSON codes can simply be copied into your own level.
Unordered
{
"with": "[[MEDIA.{}]]",
"variable": "file",
"next": "your_loop_state",
"repeat": true,
"reverse": false
}
The with field contains the name of the collection together with empty curly brackets. In this way, the collection MEDIA is iterated from top to bottom.
Ordered
Unordered playback is not necessarily the goal in this case, as an order was previously defined. For this reason, it is possible to further customize the with field:
{
"with": "[[MEDIA.{type:'atmo', $sort:{ID:1}}]]",
"variable": "file",
"next": "your_loop_state",
"repeat": true,
"reverse": false
}
In this example, the curly brackets are not empty, but contain an inline query (Strictly speaking, {} is also an inline query that simply returns every document from the collection). The first part of the query determines which type of files should be played. In the second part of the query, the $sort modifier is used to define the order of the elements along the ID.
Referencing the document
A state with the name your_loop_state can now be created and a Log Message with the following content can be created in it:
Best in conjunction with a Timeout Action, otherwise the process runs so fast that it cannot be tracked.