'TypeScript Interfaces and Types: A Comparison' cc: smpnjn typescript javascript
In TypeScript, you might have noticed that you can declare custom types in two different ways. One is with thekeyword. As such, you may find yourself wondering why there are two ways to do one thing - and you're not alone. I already covered how to use interfaces and1. Interfaces are extendable - types are not
If we define a type in TypeScript, it is not extendable after the fact. For example, consider this custom type I just made up:If, after it’s been defined, I suddenly realize that I want to add an address too, I will need to change the original type declaration. With interfaces, we can declare something new, and extend user:
interface user { name: string; age: number; } interface userWithAddress extends user { address: string }2. Interfaces can be merged - types cannotcan if you declare them multiple times. For example, if we have a type, we can't do something like this:. Meanwhile, with, we can do that - and it'll merge both declarations. So the example below will create a type called
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