FHIRPath Function: aggregate

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Summary

• Category: Aggregates
• Section: 7.1
• Return Type: value
• Empty Input Result: empty
• Errors on Multiple Input: false

Description

Performs general-purpose aggregation by evaluating the aggregator expression for each element of the input collection. Within this expression, the standard iteration variables of $this and $index can be accessed, but also a $total aggregation variable.

Arguments

• aggregator: expression - Expression to evaluate for each element
• init (optional): value - Initial value for the accumulator

Type Mapping

• n/a

Example

value.aggregate($this + $total, 0)