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foreach-else
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| It would be nice in C# to have a foreach-else. | |
| I would like the else branch to execute when the collection was empty. | |
| In that sense, either I loop over a collection OR I execute this code. | |
| This would change | |
| var empty = true; | |
| foreach (var e in enumeration) { | |
| empty = false; | |
| // ... | |
| } | |
| if (empty) { | |
| // ... | |
| } | |
| to | |
| foreach (var e in enumeration) { | |
| // ... | |
| } else { | |
| // ... | |
| } | |
| Some people think that it's a solution to do | |
| if (enumeration.Any()) { | |
| foreach (var e in enumeration) { | |
| // ... | |
| } | |
| } else { | |
| // ... | |
| } | |
| But please note that | |
| a) this requires allocations of unnecessary iterators | |
| b) foreach is nested one additional level, but most important | |
| c) you get those annoying warnings that you're enumerating your IEnumerable more than once. | |
| I think the way it is named in Python is wrong. I don't have a name, but as it is explained | |
| right in the beginning of an article [0] it is confusing and does not match the intuitively | |
| expected behavior. What more reason do I need to discard this right away? | |
| [0]: http://python-notes.curiousefficiency.org/en/latest/python_concepts/break_else.html |
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