Make your Rust code more DRY
This lesson takes an existing function with duplicated functionality and makes it more DRY by extracting core functionalities into another function.
Instructor: [00:00] To wrap it up, let's take this duplicated functionality of reading the input and parsing the value, and put it in a separate function. For that, we go ahead and create a function, readUserInput(), which will return a number. Then, we just take one of our input functionalities, copy it over, and make it a little bit more generic.
[00:30] We don't need this. Let's call this one input instead, change it here as well. Our variable is now going to be a digit. This is going to be input, this is going to be digit. Last but not least, we need to return the digit.
[00:49] A little bit of formatting, and then we can go ahead and make use of that function by saying, let a = readUserInput(). Then, we get rid of this. We can do exactly the same for our variable b, copy this over here, "Please enter the first number," and there we have our optimized program.
[01:20] This should work the same way as before, so if we do cargo run, we can enter a first number and a second number. It still works. It still keeps us asking. That's how you make your code a bit more dry.