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The Wolfram Language 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.

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

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

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

UpTo — a certain number of elements, or as many as are available

Append ▪ Prepend ▪ Insert ▪ Delete ▪ AppendTo ▪ PrependTo

Position — find positions of elements matching a pattern

PositionSmallest, PositionLargest — find positions of the smallest or largest elements

FirstPosition ▪ Extract ▪ ReplacePart ▪ MapAt ▪ ArrayRules ▪ Ordering

Length ▪ Dimensions ▪ ArrayDepth ▪ LengthWhile

Select, SelectFirst — select elements that satisfy a criterion

Cases, FirstCase — give elements that match a pattern

Pick ▪ BinLists ▪ Count ▪ Gather ▪ Tally

DeleteCases ▪ DeleteElements ▪ DeleteDuplicates ▪ DeleteAdjacentDuplicates

Nothing — an element automatically removed from lists

MemberQ — test whether an element is a member of a list

FreeQ ▪ ArrayQ ▪ VectorQ ▪ MatrixQ

AllTrue ▪ AnyTrue ▪ NoneTrue

Max ▪ Min ▪ MaximalBy ▪ MinimalBy

Finding Sublists

SequencePosition ▪ SequenceCases ▪ SequenceCount

Finding Subsets

SubsetPosition ▪ SubsetCases ▪ SubsetCount

Related Tech Notes

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Manipulating Elements of Lists

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Adding, Removing, and Modifying List Elements

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Getting Pieces of Lists

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Testing and Searching List Elements

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Manipulating Lists by Their Indices

Related Guides

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Parts of Matrices

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Parts of Expressions

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Rearranging & Restructuring Lists

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Constructing Lists

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Handling Arrays of Data