New in 10.0: Core Language & Structure

Association ( <|…|> ) — an association between keys and values

Key — indicate a key within a part specification

Merge — combine elements that have common keys

Counts, CountsBy — associate values with the number of times they occur

GroupBy — group values by collecting those sharing a criterion ("map reduce")

JoinAcross — combine lists of associations that match ("SQL join")

PositionIndex — build an index of positions at which values occur

TemplateObject — general symbolic template

TemplateExpression — an arbitrary expression evaluated when the template is applied

EntityValue — get values for properties of entities

Entity — represent a particular entity in the world

SelectFirst, FirstCase, FirstPosition — find the first element satisfying a criterion

MaximalBy, MinimalBy — find elements that maximize, minimize a criterion

AllTrue, AnyTrue, NoneTrue — apply a test multiple times across a list

IntersectingQ, DisjointQ, SubsetQ — compare elements of two sets

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