Validation rules
The purpose of a form is to validate the entered data. Unlike other solutions, where a developer is given a single validate function, React Advanced Form uses smart built-in validation algorithm based on the Validation schema. It is a convenient functional way of declaring validation rules, from simple to complex.
This part is going to focus on how to declare a validation schema and write the rules. We are going apply the validation rules and messages to the forms in the next part.
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