Add arguments to the function

- [Narrator] The function we have right now is usable, but it's not very useful. It's completely reliant on us defining these two variables a and b, because they're being used inside the function itself, and this is not good practice. What I want to be able to do is pass whatever values I want into the function and then have it run on those values, so I can reuse the function again and again. I do that using Arguments. To set up Arguments, we simply list out the arguments we want in the function definition up here inside the parentheses. So in this case, I want the arguments a and b.

Now a here will become a inside the code block, and b will become b inside the code block. But don't get these two arguments, a and b, confused with these variables down here. Let me show you what I mean. If I change these variable names to firstFraction and secondFraction, I can then pass the values of each of these variables into my function using them as arguments. So the first argument, which we'll map to a, is firstFraction.

The second argument, which we'll map to b, is secondFraction. Save this, and we get the same results in the console as before, a 0.75. So what's happening here is we first placed three over four inside firstFraction, then we run findBiggestFraction. Send three over four to a, then a is used inside the function and we get the result we want. So, why would I want to do this? Well, the answer is quite simply, I want to reuse this function as many times as necessary and now that I have Arguments, I can do just that.

Watch, findBiggestFraction, let's say seven over 16 by 13 over 25, save. And now we have two results. In the first test for firstFraction and secondFraction the answer is a .75. In the second test seven over 16 by 13 over 25, the answer is b .52 I can keep doing this.

What we have here now is a reusable function and this is kind of the whole point of functions. Once you set them up correctly you can use them again and again to perform functions on different types of values and that makes your code leaner and more easy to maintain.