Bounded types in fp-ts

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  • io-ts

    Runtime type system for IO decoding/encoding

    Another situation where the idea of narrowing a type arises when we receive JSON at runtime and wish to convert the data inside the JSON into our own stricter types within our domain. Check in next time for an article around the same concepts using io-ts.

  • fp-ts

    Functional programming in TypeScript

    A Bounded is used to name the upper and lower limits within the a type for your domain. So for example, in this example, I am going to use a Bounded from the fp-ts library to represent the age of a person within the bounds of 18 & 100.

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