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Ternary If2:53 with Jeremy McLain
This bit of syntactic sugar can reduce simple if / else conditionals to a single line.
Let's take a second look at the if else statement we wrote in the previous video. 0:00 This is a very basic if else statement that 0:04 we can actually turn into a single line using the ternary if operator. 0:07 The ternary if operator is a bit of syntactic sugar 0:11 that can greatly simplify if else blocks like this. 0:15 I'll show you how it's used here. 0:19 The way we use this is to replace the if and else along with their curly braces 0:21 with the question mark and colon characters like so. 0:26 This is doing exactly the same thing that the previous code did. 0:46 This will return a map location if path step is less than 0:50 path.length otherwise it will return null. 0:55 The return keyword is not part of the ternary if. 1:00 We could have assigned the result of this expression to a variable instead. 1:03 Returning two different values based on a condition, 1:10 is a very common coding pattern. 1:13 It's a good place to use the ternary if operator. 1:15 In fact, you might see lots of places you could use the ternary if operator 1:19 instead of using if else. 1:23 You need to use your judgment though. 1:25 Sometimes using this syntactic sugar in places where it isn't obvious 1:27 why you're using it, can make code more difficult to understand. 1:32 So only use it in cases where it's very obvious why it's happening. 1:36 Part of the reason I'm showing it here is so 1:41 that you can recognize it when you see it in code you might read in the future. 1:44 Another good tip for using it is to use parenthesis. 1:49 We don't actually need to use parentheses here, but 1:53 i think it makes it more obvious what the condition is. 1:56 You could also put parenthesis around these other operands to clarify 2:00 the two different results. 2:04 Let's compile this just to make sure we haven't broken anything. 2:08 So going to the console ncs 2:11 -out:Treehouse *.cs. 2:14 Looks like we do have a compiler error. 2:22 It says class struct or interface method must have a return type. 2:24 Let's see here. 2:28 Path.cs, line 12. 2:29 Looks like I forgot to say that we want to return a MapLocation here. 2:35 Let's try this again. 2:43 There we go, it all works. 2:46 It's a good thing we have a compiler to help us out? 2:49
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