Writing an (almost) functional app in an (almost) functional way — In the previous article of this series, we tackled the most complex types of validations by exploring different ways we can use context in our rules. We have come a long way, but we only used our code isolated in unit tests. We would like to see how our code…

Validations within a context — In the first part, we used inline classes to set a type-safe foundation for our model, and in the second part, we validated multiple properties and accumulated the errors. …

Don’t fail fast; fail comprehensively — In the first part, we used inline classes to set a type-safe foundation for our model. It was an important step, but we’re a long way from considering our whole domain validated: we just validated email addresses. Next, we will validate multiple properties, accumulate the errors, apply individual element validations…