FreeQ

可用

Tests whether an expression does NOT contain a given subexpression.

形式

FreeQ[expr, form]

FreeQ[expr, form, levelspec]

FreeQ[form]

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

在 Qurak 上运行搜索参考

主题

Elements Of Lists - Finding Sublists
Expressions - Expression Testing »
Operations On Sets - Testing Elements in Sets
Pattern Matching Functions - Patterns for Part Specifications
Testing Expressions - Expression Tests

相关

MemberQ MatchQ Count StringFreeQ KeyExistsQ ContainsAny ContainsOnly AllMatch AnyMatch AllTrue AnyTrue Cases

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