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Now what if you want JavaScript to go down one path when an expression is truthy but another path when it is falsy Simply append an else clause to your if condition. To do so, simply type the else keyword and then a path in the form of a child statement or block. JavaScript will run the if path when the boolean expression is true and else path when it is false. So, one or the other path will run, but never both. Currently, both mayfly.addToTally() and mayfly.kmLeftToLive() return undefined whenever JavaScript does not run their if paths. Let s change that by adding else clauses to both methods. To do so, click Clear in Firebug, enter the following, and click Run: var mayfly = function () { var tally = 0; return { addToTally: function (km) { if (typeof km === "number" && isFinite(km)) { return tally += km; } else { return "Invalid parameter!"; } }, kmLeftToLive: function () { if (tally < 100) { return "Mayfly has " + (100 - tally) + " kilometers left to live."; } else { return "Mayfly is dead!"; } } } }(); Now click Clear, and enter the following: mayfly.addToTally("ten"); // "Invalid parameter!" Here, typeof km returns "string", so the === operator returns false, and in turn the && operator returns false. Therefore, JavaScript goes down the else path, and mayfly.addToTally() returns "Invalid parameter!" rather than adding km to tally, which remains at 0. Let s verify this by clicking Clear and then invoking mayfly.kmLeftToLive() like so: mayfly.kmLeftToLive(); // "Mayfly has 100 kilometers left to live." Great, so our Mayfly still has a full tank. Now let s make sure the else clause for mayfly.kmLeftToLive() works by clicking Clear and then running the following: mayfly.addToTally(110); mayfly.kmLeftToLive(); // "Mayfly is dead!"

Public Sub Listing1_13(ByVal people As List(Of Person)) selectDelegate = New Func(Of Person, Integer, Projection)(AddressOf selectProjection) Dim result As IEnumerable(Of Projection) = _ Sequence.Select(Of Person, Projection)(people, selectDelegate) ObjectDumper.Write(result) End Sub End Class

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If you look back at the code we used for the simple sequencer master program, you can see that the value controlling what program runs is the Counter variable. If there was a way to increase or decrease the value of the Counter variable, we could have much more control over what programs are run in what sequence. In our example where we wanted to rerun the Collect Scientist Minifigs program, all we really need to do is get the value of the Counter variable back to 0, since this program is the first in our sequence. Figure 11 5 shows a new thread with a Wait block. This Wait Block is waiting for the left arrow button the NXT brick to be bumped. Using the bump, instead of pressed, setting is important because if we used the pressed action, the value would decrement continuously until the button is released. When the left arrow is bumped, the value of the Counter variable is decremented by 1. In our example, this would put us back at 0, where we want to be to rerun the first program in our sequence.

So tally < 100 returns false, and JavaScript goes down the else path. Therefore, mayfly.kmLeftToLive() returns "Mayfly is dead!" to indicate that it s time to buy a new Mayfly. By the way, even if you are not a runner, you might want to try the Mayfly sometime. The upper part is bright orange with a black support grid resembling the wing of a fly you will be hard to miss in a pair of those!

This code snippet creates an anonymous type called Projection, formed by the full name of the person anticipated by the element position in the sequence. See Figure 1-7 for the output.

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