Defensive coding is a programming practice that helps make TypeScript applications more reliable and robust. It involves checking input data for errors, handling errors gracefully, respecting data boundaries, enforcing assumptions, and providing fail-safe defaults. By following these principles, developers can reduce the risk of bugs and security vulnerabilities.
An assertion function is a runtime check that identifies the type of unknown input. TypeScript's compiler assumes the input is of the type claimed by the assertion function's signature. Assertion functions are useful for uncertain values, like user input, and generate runtime checks. They can raise errors if the input doesn't meet criteria.
TypeScript's compiler doesn't allow custom type annotations for errors in try-catch statements. The simplest type guard is a conditional block with an instanceof check. Other type guards are presented in this article.
In this tutorial, you will learn how to improve your switch statements and fix certain errors in TypeScript. The article provides tips and tricks, as well as a final code example. Some key takeaways include setting `noImplicitReturns` to `true`, creating a switch case for every valid value, defining a custom return type, and adding a default case to handle unexpected values.
Static methods in programming are functions that can be called directly from a class without needing to create an instance of the class. They are useful when you have a function that doesn't rely on any internal state of the class.