Class

Iterating Expression

Abstract intermediate for expressions that bind each element of `source` to a loop variable and evaluate a per-element body. The body's shape and the way the runner combines results vary per subclass — concat into a string for ForEach, collect into a list for ListMap, predicate-filter for Filter, group for PartitionBy, dedupe for DistinctBy.

Class
Subclass Of
List-Sourced Expression

Referenced by

← Domain

Datatype PropertyLoop VarName under which each element of `source` is bound while the body expression evaluates. Local to the iterating expression — does not leak into surrounding…

← Subclass Of

ClassDistinct ByIterates `source`, evaluates `distinctKey` per element with `loopVar` bound, and keeps the FIRST element seen for each distinct key value. Returns the…
ClassFilterIterates `source`, evaluates `predicate` per element with `loopVar` bound, and returns the subset of elements for which the predicate yields a truthy value.…
ClassFor EachIterates `source`, evaluates `emit` per element with `loopVar` bound, and concatenates the string results. Use for stringification where order matters and the…
ClassList MapIterates `source`, evaluates `mapBody` per element with `loopVar` bound, and collects the results into a new list (preserving order). Use when the result feeds…
ClassPartition ByIterates `source`, evaluates `partitionKey` per element with `loopVar` bound, and groups elements by their key value. Returns a list of Partition embeddeds,…