Elements of Lists

Mathematica provides a carefully chosen set of functions for accessing elements of lists using either indices or positions, or using patterns or criteria for their values.

ReferenceReference

list[[...]] (Part) — parts of lists, resettable with

Span (;;) general specification for spans or blocks of elements

First ▪ Last ▪ Rest ▪ Most ▪ Take ▪ Drop ▪ TakeWhile

Append ▪ Prepend ▪ Insert ▪ Delete ▪ AppendTo ▪ PrependTo

Position find positions of elements matching a pattern

Extract ▪ ReplacePart ▪ MapAt ▪ ArrayRules ▪ Ordering

Length ▪ Dimensions ▪ ArrayDepth ▪ LengthWhile

Select select elements that satisfy a criterion

Cases give elements that match a pattern

Pick ▪ DeleteCases ▪ BinLists ▪ Count ▪ DeleteDuplicates

MemberQ test whether an element is a member of a list

FreeQ ▪ ArrayQ ▪ VectorQ ▪ MatrixQ

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