What are some examples of parameter validation in programming?

What are some examples of parameter validation in programming?

Parameter validation ensures that inputs to functions or methods meet certain criteria. Examples include checking if a string is not empty, ensuring a number is within a specific range, or validating an email format.

Can you give me a specific code example for validating an email address?

Sure! In Python, you can use a regular expression to validate an email like this:

import re

def is_valid_email(email):
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    return re.match(pattern, email) is not None

What about validating a number to ensure it's within a range?

You can validate a number in Python like this:

def is_valid_number(num, min_value, max_value):
    return min_value <= num <= max_value

Are there libraries that can help with parameter validation?

Yes, libraries like Cerberus and Pydantic in Python can help with more complex validation rules.