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63 lines
3.0 KiB
Markdown
63 lines
3.0 KiB
Markdown
---
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hide_title: true
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hide_table_of_contents: true
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title: Array Map
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---
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<##head##>
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# Array Map
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This node takes an input array, runs a small map script on each item, and outputs the resulting mapped array. That is an array with new objects, each created in the mapping script.
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<div className="ndl-image-with-background l">
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</div>
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<##head##>
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## Inputs
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| Data | Description |
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| --------------------------------------- | ------------------------------------------------------------ |
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| <span className="ndl-data">Items</span> | <##input:items##>The array that should be mapped.<##input##> |
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### Script
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The mapping script used to map the objects in the input array to new objects in the mapped output array. The script should be provided in the following format:
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```javascript
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map({
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FullName: () => object.first_name + object.last_name,
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Age: 'years_old',
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})
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```
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You can either provide a string with the name of the property that should be mapped with the syntax _to:'from'_ which will simply rename a property taking the value directly from the input object. Or you can provide a mapping function that takes the object (of the type [Noodl.Object](/javascript/reference/object)) and the function should return the mapped value.
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Sometimes you need to extract the **Id** of the objects you are mapping, this can be done in the following way:
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```javascript
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map({
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Value: () => object.getId(),
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Label: 'PhotoName',
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})
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```
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Note that the objects that are created when mapping are new objects so they will have their own Id as well.
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## Outputs
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### General
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| Data | Description |
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| --------------------------------------- | ---------------------------------------------------------------------------------------------------------------- |
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| <span className="ndl-data">Items</span> | <##output:items##>The mapped array.<##output##> |
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| <span className="ndl-data">Count</span> | <##output:count##>The number of items in the mapped array (this will be the same as the input array)<##output##> |
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| Signal | Description |
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| ------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| <span className="ndl-signal">Changed</span> | <##output:changed##>A signal is emitted here when the input array has been modified which will trigger the _Array Map_ node to remap the input and produce a new output _Items_.<##output##> |
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