Some of the typical string-related checks would validate whether an empty string has 0 length, accessing out-of-index results in an error message or exception, and so on.

The horizontal cross section of the pyramid is square at any level, with each side measuring 229 m (751 ft) in length. The maximum error between side lengths is astonishingly less than 0.1%.

Since we implement no metadata service in this example, the method returns an array with length 0 (returning null would have indicated an error).