What are some examples of runtime type checking in programming?

What are some examples of runtime type checking in programming?

Runtime type checking is the process of verifying the types of variables at runtime. Examples include using the typeof operator in JavaScript, or the isinstance() function in Python.

Can you give me a specific example in Python?

Sure! In Python, you can use isinstance(variable, type) to check if a variable is of a specific type. For example:

x = 10
if isinstance(x, int):
    print('x is an integer')

What about in JavaScript?

In JavaScript, you can use the typeof operator. For example:

let x = 'Hello';
if (typeof x === 'string') {
    console.log('x is a string');
}

Are there any libraries that help with runtime type checking?

Yes, libraries like prop-types for React and Joi for Node.js can help with runtime type checking by providing validation schemas.