Typed Parameters in TypeScript – Node.js Tutorial 28

TypeScript is a superset of JavaScript that adds static typing to the language. This allows developers to catch errors at compile time rather than at runtime. One feature of TypeScript that can help with this is typed parameters.

Typed parameters allow you to define the types of parameters that a function expects. This can help prevent bugs by ensuring that only the correct types of arguments are passed to a function.

Here’s an example of how you can use typed parameters in TypeScript:

        
            function greet(name: string) {
                console.log('Hello, ' + name);
            }

            greet('Alice'); // This will work
            greet(42); // This will cause a compile-time error
        
    

In this example, the function greet expects a string as its parameter. If you try to pass a number instead, TypeScript will throw an error at compile time, preventing the code from running.

Typed parameters can be especially useful when working with Node.js, as it allows you to catch errors early on and write more robust code.

Overall, typed parameters in TypeScript can help you write safer and more reliable code. By specifying the types of parameters that a function expects, you can catch errors early on and prevent bugs in your code.