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by reboog711 3430 days ago
ColdFusion! It's been dead longer than I've been developing with it; but is still going strong. :ha, ha:

Seriously, though, I would not say there are any core technologies; but rather core programming concepts.

Variable memory management is one example. Knowing the difference between passing parameters by value, or by reference, when writing Lotus Notes applications actually helped me understand the difference between a variable assignment and creating a deep copy in JavaScript.

Less specific; If I had to guess--in 20 years; I'll still be working in technology that supports things like MVC(S), Dependency Injection, Singletons, Factories, etc....

Learning basic encapsulation techniques, and design patterns, is knowledge that will apply to lots of programming languages.