ofTypes

ofTypes is a JavaScript library that provides a functional approach to type checking and data validation. It allows developers to define type schemas and then use these schemas to validate whether a given JavaScript value conforms to the expected structure and types. The library emphasizes immutability and composability, enabling the creation of complex validation rules from simpler ones.

The core concept in ofTypes revolves around defining "type checkers" or "schemas." These can represent primitive types like strings, numbers, and booleans, or more complex structures such as arrays, objects, and custom types. For example, one can define a schema for an object that expects specific properties with their own defined types. The library offers a range of built-in type checkers and also allows users to define their own custom type checkers for specific validation needs.

Validation is performed by passing a value and a schema to an appropriate function provided by the library. If the value matches the schema, the validation succeeds. If it does not, the library typically returns an error object or throws an exception, indicating the nature of the mismatch. This makes ofTypes useful for ensuring data integrity, especially in scenarios involving API responses, user input, or inter-component communication. Its functional design promotes writing reusable and declarative validation logic.