What are some examples of custom validation in programming?

What are some examples of custom validation in programming?

Custom validation refers to the process of creating specific rules to ensure data integrity. For example, in a form, you might want to validate that a user's age is over 18.

Can you give me a specific example in JavaScript?

Sure! In JavaScript, you can create a custom validation function like this:

function validateAge(age) {
    return age >= 18;
}

This function checks if the age is 18 or older.

What about in Python?

In Python, you could use a similar approach:

def validate_age(age):
    return age >= 18

This function will return True if the age is valid.

Are there any libraries that can help with custom validation?

Yes, libraries like Joi for JavaScript and Marshmallow for Python provide powerful tools for custom validation.