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In the previous lesson, we showed you how we can set up the player selection and track that information,

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and then earlier we also saw how we can generate a random selection for the computer play.

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Now we need to compare both of those results and determine who wins.

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So setting up a variable, we're going to call it result, and we're going to link that to a function

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that we're going to create, which will be check winner.

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We need to pass in some values into it.

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So one of the values that we need to pass in is the player selection.

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So let's set up a variable for that.

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So player selection, and that's going to equal to what we were originally outputting into the console.

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And we saw that earlier as rock.

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And then we also saw that the computer selection is there as well.

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So taking the player selection and it actually doesn't matter which one is first, it will differentiate

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between the logic.

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So we've got player selection and computer selection.

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We need to pass both of those values into our result function in order to be able to check those values

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and determine a winner.

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And that means that we need to create a function for this.

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So creating a function, we're going to call it check winner.

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And within this function, we've got two parameters.

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So we've got the player and we've got the computer and we need to do a comparison.

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And this is going to be quite a few different conditions that we're checking.

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So we're checking to see if the player is equal to the computer selection.

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And if it is, then we're going to simply return back a draw, the return back, the word draw.

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And I'm going to also add in one more line here where we're going to log out the results of result.

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So that was the first condition.

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So that takes care of if both of them are matching the next one.

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Let's check to see if the player has selected rock, if the player has selected rock, that we know

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that the computer will lose if the computer has selected scissors.

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But we know that the computer will win if he is selected paper.

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So we're going to check to see if the computer has selected paper and we're going to do all of this,

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all of the logic here by wind conditions.

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So if the computer selected paper, the player selected Rock, we're going to return back the computer.

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So that's going to be the winner.

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And we're was going to return back the string of whatever the winner is.

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And if it's not a computer, then we're going to return back the player.

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And the reason here is that the player is going to be the winner in this scenario.

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So unless the computer has returned back, rocked the only other choice, because we've already taken

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the condition checking for a draw.

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So that means that they're not both the same.

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The player selected rock, and the only other choice is that the computer selected, if it didn't select

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Rock, if it didn't select paper, then it selected scissors.

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And that means that the player one condition.

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So this one is going to be very similar.

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And this is the other alternative.

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If a player selected paper, we're going to check to see what the computer selected.

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So the same format as just above.

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We're going to check to see if the computer selected scissors and if the computer selected scissors,

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then that means that the computer wins.

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And if the computer didn't select scissors, there's only one last option.

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And that means that the player won because the computer selected rock.

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So refresh.

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Refresh it and we'll hit rock, so we selected Rock, the computer selected paper, and that means that

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the computer won because the paper beats the rock.

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Well, try rock one more time.

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We see we both selected rock, so it returned back to draw, and this time we selected Rock Computer,

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selected scissors.

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So that means that we were the winner.

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So that was a nice selection of all the different options.

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And we could try the same thing for paper again, paper draw.

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It's always a good idea to play through it a little bit just to make sure that your logic is working,

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it's being applied properly and that you are returning back the correct winner.

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Remember again that the order here is important if you switch it around in this logic isn't going to

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work and you have to switch these values around as well, or you can switch around some of the logic.

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So go ahead and add this into your project, try it out and make sure that you are returning the correct

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winner and you can be ready to move on to the next step where we're going to be associating score and

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outputting who the winner is to the player.

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So that is all still yet to come.