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The prototype chain, such as those we saw earlier, determines which type or types an object such as mintChocolateChunk is an instance of, that is, what constructor or constructors an object inherits members from. To figure this out, you would use the aptly named instanceof operator, which we didn t cover in 3. Note that instanceof, like typeof, is in lowercase, not camel case. Let s query JavaScript in regard to what types mintChocolateChunk is an instance of with instanceof. Note that the second operand to instanceof is the identifier for the constructor, so don t append the () operator. Note too that like every object, mintChocolateChunk is an instance of the Object() constructor, from which it inherits methods like valueOf() and toString(). So as Figure 5 8 displays, mintChocolateChunk is an instance of four types, which is to say it inherits members from four constructors. var VanillaBean = function(vanilla, cinnamon) { this.vanilla = [1, "bean", vanilla vanilla : "Madagascar Bourbon"]; cinnamon && (this.cinnamon = [1, "stick", "Saigon"]); }; VanillaBean.prototype = { heavyCream: [1, "cup", "Organic Valley"], halfHalf: [2, "cup", "Organic Valley"], sugar: [5/8, "cup"], yolks: [6] }; var Coffee = function(coffee) { this.coffee = coffee || [1/4, "cup, coarsely ground", "Starbucks Espresso"]; }; Coffee.prototype = new VanillaBean(); var Chocolate = function(cocoa, bittersweet) { this.cocoa = cocoa || [3/16, "cup", "Callebaut"]; this.bittersweet = bittersweet || [1 + 1/2, "cup", "Callebaut"]; }; Chocolate.prototype = new VanillaBean(); Chocolate.prototype.yolks = [4]; var MintChocolateChunk = function(mint) { this.mint = mint || [1, "cup", "fresh mint leaves"]; }; MintChocolateChunk.prototype = new Chocolate(); MintChocolateChunk.prototype.vanilla = [1/3, "bean", "Madagascar Bourbon"]; MintChocolateChunk.prototype.bittersweet[0] = 1; delete MintChocolateChunk.prototype.cocoa; var mintChocolateChunk = new MintChocolateChunk(); mintChocolateChunk instanceof MintChocolateChunk; // true mintChocolateChunk // true mintChocolateChunk // false mintChocolateChunk // true mintChocolateChunk // true instanceof Chocolate; instanceof Coffee; instanceof VanillaBean; instanceof Object;

Tip No matter how you decide to make record of your robot design, be sure to include the resulting documents in your team s technical notebook.

Figure 5 8. mintChocolateChunk is an instance of four types, which is to say it inherits members from four constructors.

ObjectDumper.Write(IIf(numbers.All(allDelegate), "Yes, they are", "No, they aren't")) End Sub End Class

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It s important to note inherited members are shared among instances. So if you recall from 3, the === will return true for a member that two instances share, even a member that is an object, array, or function. To illustrate the point, let s chain && comparisons in order to confirm that instances of VanillaBean, Coffee, Chocolate, and MintChocolateChunk share the heavyCream array, [1, "cup", "Organic Valley"], verifying our work with Figure 5 9: var VanillaBean = function(vanilla, cinnamon) { this.vanilla = [1, "bean", vanilla vanilla : "Madagascar Bourbon"]; cinnamon && (this.cinnamon = [1, "stick", "Saigon"]); }; VanillaBean.prototype = { heavyCream: [1, "cup", "Organic Valley"], halfHalf: [2, "cup", "Organic Valley"], sugar: [5/8, "cup"], yolks: [6] }; var Coffee = function(coffee) { this.coffee = coffee || [1/4, "cup, coarsely ground", "Starbucks Espresso"];

Unless you have the resources to build a back up robot, having design documentation of your robot can be very helpful if something happens to your actual robot. Few things are worse than being at a competition and finding a spare part in the box that you used to transported your robot to the event and not knowing where it belongs on the robot. Even worse is if the robot gets dropped (yes, it happens) and falls into pieces, and you don t know how to put those pieces back together again. Having some form of images or instructions for your robot can become critical at this point. Also, it s a good idea to document the evolution of your robot design as it progresses during the season. This is helpful if you need to revert to a previous design. Also, technical judges like to see this evolution process of your design. Be prepared to describe the changes you made and why you made them to the judges as well. If you choose to take photographs of your robot chassis, make sure to get pictures from various points of view. Having just a picture of the robot s profile will not be very helpful if you have to remember how the gears on the underside drive system are connected. In Figure 13 10, you can see some example photos that were used in a technical notebook to describe a robot s design.

<Extension> _ Public Shared Function Any(Of T)(ByVal source As IEnumerable(Of T)) As Boolean <Extension> _ Public Shared Function Any(Of T)(ByVal source As IEnumerable(Of T), _ ByVal predicate As Func(Of T, Boolean)) As Boolean

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