Powershell: nulls, empty arrays, single-element arrays

One of the biggest gotchas for people new to Powershell is the handling of null, empty arrays, and single-element arrays.  If you come from another language such as c# you’ll be shocked.  And even for an experienced Powershell writer, the behavior can lead to ugly bugs.

Other people have covered this topic before.  Here’s a good discussion by Keith Hill.  But I wanted a short reference with examples of the strange (to many people) behavior, so I’m writing this today somewhat for my own benefit.  But maybe someone else will find it useful.

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