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Specify Function Arguments using Types in PureScript

JavaScript does its error-checking at runtime, but PureScript has a compiler, which makes sure that your program has no errors before it converts it all into JavaScript.

PureScript's compiler uses a type system to catch errors so that you aren’t accidentally mismatching your types. We will learn the very basics of type declarations, how they work in a statically typed language like PureScript, and see simple examples of them in action.

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