How can Yup be used for validating conditions?

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Yup is a JavaScript schema validation library that can be used to validate conditions. It allows you to define a schema for an object and then validate that object against the schema. Here's an example of how Yup can be used to validate conditions:

1. Define a schema using Yup:

const schema = yup.object().shape({
  age: yup
    .number()
    .min(18, 'Must be at least 18 years old')
    .max(99, 'Cannot be older than 99 years old')
    .required('Age is required'),
  email: yup
    .string()
    .email('Invalid email')
    .required('Email is required'),
});

1. Validate an object against the schema:

const person = {
  age: 25,
  email: 'john@example.com',
};

schema.validate(person)
  .then(() => console.log('Valid!'))
  .catch((err) => console.error(err.errors));

In this example, the schema defines two conditions for the age property: it must be between 18 and 99 years old, and it is required. The schema also defines conditions for the email property: it must be a valid email address, and it is required.

When we validate the person object against the schema, Yup will check that the age and email properties meet the defined conditions. If the object is valid, the then() method will be called. If the object is invalid, the catch() method will be called with an array of error messages.

Yup can also be used to validate nested objects, arrays, or any other data type. By defining a schema for your data, you can ensure that it meets your defined conditions, and avoid errors or unexpected behavior in your application.