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Use this mapper to pull one field out of every item in a list and collect those values into a single, flat result. For example, from a list of order lines you can grab just the product names, or from a list of customers just their email addresses. You can also choose which field to use as the key for each value, so the result becomes a lookup table instead of a plain numbered list.

Fields

Sample data

This example reads the product name from each order line and keys each name by its SKU. Input:
Output:
Leaving the Index key empty would instead give a numbered list of names, ["Wool scarf", "Leather belt"].