Parts of Expressions

Mathematica's unified symbolic architecture allows immediate generalization of part-oriented list operations to arbitrary expressions—supporting operations both on individual parts, and on collections of parts at specified levels in expression trees.

ReferenceReference

Part (..[[..]]) get any part of an expression (reset with )

Length ▪ First ▪ Last ▪ Most ▪ Rest ▪ Take ▪ Drop ▪ Extract

ReplacePart replace numbered parts of an expression

Append ▪ Prepend ▪ Insert ▪ Delete ▪ DeleteCases

Position find the positions of any pattern in an expression

Cases find cases of any pattern in an expression

MapAt apply a function at particular positions in an expression

Map (/@) — apply a function at specified levels in an expression

MapAll (//@) — apply a function to all parts of an expression

Heads option for specifying whether to include heads

Sow, Reap collect parts "sown" inside of an expression

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