collectionhasMemberelement
collectionhasMemberelement is a term used in computer science and formal methods to denote the relation that a collection contains a given element. In practice, it refers to a membership test or predicate: given a collection C and an element e, collectionhasMemberelement(C, e) is true if e is an element of C. The exact meaning depends on the type of collection and the language: for sets, membership is true if e is one of the set's elements, often with O(1) average time; for lists or sequences, membership requires scanning and is typically O(n). In hash-based collections, contains or has is usually implemented via hashing.
In languages with implicit membership operators, such as Python's in or Java's contains, the same concept is
The relationship is fundamental to data structures, algorithms, and query languages, and it underpins operations like