In the TypeScript version of the code, we've defined the types of the a and b arguments as number, which means that the TypeScript compiler will only allow values of the number type to be passed to the sum function. If we try to pass a string value like in the JavaScript code, the compiler will throw an error and prevent us from running the code. This type-checking can help us catch errors early on and prevent runtime exceptions.

In addition, the TypeScript version of the code is easier to read and understand, thanks to the type annotations. Other developers can quickly see what type of values the sum function expects, and use that information to avoid making mistakes when calling the function.

Overall, TypeScript can provide better type-safety and improved readability compared to JavaScript.

In the above JavaScript code, the sum function accepts two arguments and returns their sum. However, the function is not type-safe, which means that it will allow you to pass arguments of any type. In this case, we're passing a number and a string, which results in the concatenation of the two values.
This can be a common source of errors, especially in larger codebases.

Here's the same code written in TypeScript:

In the TypeScript version of the code, we've defined the types of the a and b arguments as number, which means that the TypeScript compiler will only allow values of the number type to be passed to the sum function. If we try to pass a string value like in the JavaScript code, the compiler will throw an error and prevent us from running the code. This type-checking can help us catch errors early on and prevent runtime exceptions.

In addition, the TypeScript version of the code is easier to read and understand, thanks to the type annotations. Other developers can quickly see what type of values the sum function expects, and use that information to avoid making mistakes when calling the function.

Overall, TypeScript can provide better type-safety and improved readability compared to JavaScript.