On the other hand they're really old now and, obviously, don't get that that old. So it's the kind of thing you learn once and then you'll inevitably find the

On the other hand they're really old now and, obviously, don't get that that old. So it's the kind of thing you learn once and then you'll inevitably find the use for some of them, or find them in codebases, for a very long time. I don't know if I to smile or lament that it's basically the ones that were explained in the gang of four's Design Patterns book... Nearly, what, 30 years ago now? (now I feel really old)