Differences Between Type Aliases and Interfaces TypeScript is only concerned with the structure of the value we passed to printCoord - it only cares that it has the expected properties.īeing concerned only with the structure and capabilities of types is why we call TypeScript a structurally typed type system. Just like when we used a type alias above, the example works just as if we had used an anonymous object type. When a value is of type any, you can access any properties of it (which will in turn be of type any), call it like a function, assign it to (or from) a value of any type, or pretty much anything else that’s syntactically legal: TypeScript also has a special type, any, that you can use whenever you don’t want a particular value to cause typechecking errors. Note that is a different thing refer to the section on Tuples. We’ll learn more about the syntax T when we cover generics.
You may also see this written as Array, which means the same thing. string is an array of strings, and so on). To specify the type of an array like, you can use the syntax number this syntax works for any type (e.g. Always use string, number, or boolean for types.
The type names String, Number, and Boolean (starting with capital letters) are legal, but refer to some special built-in types that will very rarely appear in your code.
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