Ontet Programming - Custom Typeguards in Java Script

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In union types, you can always use instance of as well to narrow the branch. The last one we have here is just the custom type guards. Instead of stuffingo functions full of if statements, you can take the logic out of those functions and just put them in their own functions. You could say a function is sandwich that accepts a type of food. And then from that you can just return if any of the type of the in the proper property check,. or the instance of, and that will return a bullion.

In this Hasty Treat, Scott and Wes talk about TypeScript Fundamentals, including narrowing, discriminating unions, and type guards.

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