John Sundell • 11/11/2021

Using count vs isEmpty to check whether a collection contains any elements

This Swift programming article details why using the `isEmpty` property is generally more efficient than checking `count == 0` for determining if a collection is empty. It explains the O(n) time complexity of `count` on non-random-access collections like `String` and contrasts it with the O(1) `isEmpty` implementation, which compares `startIndex` and `endIndex`. The analysis includes examples from the Swift standard library.

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#performance #time complexity #standard library