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Type: Investigation
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Resolution: Done
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Priority: Major - P3
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Affects Version/s: None
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Component/s: None
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Tools and Replicator
New options will be added to $map, $filter and $reduce, allowing users to reference the array index of the element to which the operator's expression is currently being applied.
Description of Linked Ticket
Summary
Extend $map, $filter, $reduce to expose the index of array element.
Motivation
Sometimes when working with arrays the logic depends on the position of the element. E.g. two-dimentional array represents values on the grid, and element index is a coordinate on X/Y axis; or user may want to select every other element of the array to create a sample for A/B test or parallel processing.
It's pretty cumbersome to calculate position of the element today, so we'd like to introduce a simplified syntax for it.
Example from Paul's book
Documentation
Product Description
Scope
Syntax
Technical Design
Docs Update