You Really Need TypeScript Generics

First, generics as a concept that you're already familiar with - generalising a problem with parameters. Next, the simplest example I could come up with to show why generic types aren't just a "nice-to-have", but a crucial TypeScript feature.

0:00 Similarity to JavaScript functions
0:56 Optional parameters
1:49 Generics are essential
2:06 Example: Generic function
7:25 Example: Generic class
10:33 Summary