I was wondering if the ICollection.Count is just a lookup (Time Complexity in O(1)) or iterates over the Collection. Same for the Array.Length property.
Also, if I have the option to use both, which one is better to use?
Time Complexity of ICollection.Count and Array.Length Property
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Array.Lengthis a O(1) operation - the length is stored and simply read-n-returned to the user.ICollection.Countis a member of an interface. Interfaces are contracts and hence do not contain implementations.So, anyone could write any implementation they want, so the complexity is undefined in a general case.
However, it is strongly implied — by (a) the member
Countbeing a property and by (b) the interface itself being a separate entity fromIEnumerable<>— that it should have O(1) complexity as well.