Reference documentation for Expressif functions in the array/aggregation scope.

Name Overview
broadcast Executes an accumulator once over the full input enumerable, then returns the final accumulated value repeated once for each input element. Returns null when the input is not an enumerable or is a string.
fold Executes an accumulator once over the full input enumerable and returns the final accumulated value. Returns null when the input is not an enumerable or is a string.
scan Executes an accumulator progressively over the input enumerable and returns the intermediate accumulated value after each input element. Preserves input cardinality (one output item per input item). This differs from fold (final value only) and broadcast (final value repeated). Returns null when the input is not an enumerable or is a string.

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