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FMX anti-pattern: returning nil rather than raising an exception on an invalid state or arguments

Delphi Haven – In the Delphi RTL and VCL, a method called LoadFromFile or the like will raise an exception if the file doesn’t exist or is invalid. Similarly, if an object property getter implements a lazy-loading pattern (meaning, the value of the property will only be initialised when first needed), it will raise an exception if the situation is such that nothing valid can be loaded or initialised. This is pretty basic exception programming – when an error arises, the flow of the calling code is forcibly interupted with a clear account of what call was invalid. Imagine if (say) ...
Favorite? Off-Topic? Chris Rolliston @ 2013-04-28 12:12


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