MemberQ

可用

Tests whether a list contains a given element.

形式

MemberQ[list, form]

MemberQ[list, form, levelspec]

MemberQ[form]

验证过的示例MemberQ[{1, 2, 3}, 2] → True MemberQ[{1, 2, 3}, 4] → False

在 Qurak 上运行搜索参考

用于

Enhanced cycle and tour functionality - 8 步

主题

Elements Of Lists - Finding Sublists
Expressions - Expression Testing »
Language Overview - Logic & Tests »
List Manipulation - Elements of Lists »
Operations On Sets - Testing Elements in Sets
Pattern Matching Functions - Patterns for Part Specifications

相关

SubsetQ FreeQ MatchQ Element Count Cases IntervalMemberQ KeyExistsQ ContainsAny AllMatch AnyMatch Position

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