This one might make you scratch your head a bit -- but learning about hash tables is definitely worth your time and effort.

In Windows PowerShell, you most likely have used arrays and hash tables. The latter is simply a different kind of an array called an associative array. When using arrays, you may have a requirement to ...

Making fast hash tables in programming, which don't cause collision trouble, is one of computing's holy grails. Facebook thinks it's created a good one.