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Figure 3 3. += only does concatenation if its right operand is not a number. Remember that every JavaScript value can be converted to a boolean or string, but not to a number. Not one you can do math with anyway. Most non-numbers convert to the not a number literal NaN. Moreover, the return value of any math operation containing a NaN operand will always be NaN. Insofar as JavaScript returns NaN whenever a value cannot be converted to a number, +=, -=, *=, and /= may overwrite a variable, member, element, or parameter with NaN. To illustrate the point, try the following sample, verifying your work with Figure 3 4. Insofar as we forgot to refine our query with the [] operator, JavaScript multiplies the array [1 + 1/4, cup ] by 3. Therefore, [1 + 1/4, cup ] is converted to the number NaN and multiplied by 3. So, the array in dough.wildBlueberries is overwritten with the return value of NaN * 3, which of course is NaN. var dough = { pastryFlour: [1 + 3/4, "cup"], almondFlour: [1/3, "cup"], saigonCinnamon: [1, "tsp"], mincedLemonZest: [2, "tsp"], seaSalt: [1/4, "tsp"], soda: [1, "tsp"], tartar: [1, "tsp"], pourableVanillaYogurt: [1, "cup"], egg: [1], wildBlueberries: [1 + 1/4, "cup"] };

After having reached the first role node, we can use the SetElement method to change the role description to the Actor. (Figure 3-12 shows the output.)

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Figure 3 4. Failing to refine our query with [] results in the array being overwritten with NaN. OK, so what would happen if we try to query the first element in dough.wildBlueberries now that that s NaN, not an array Here s a hint: see 2. Yup, if you query NaN with the . or [] operators, JavaScript creates a number wrapper for NaN. Since that number wrapper does not contain any elements, querying its first element returns undefined, as the following sample and Figure 3 5 illustrate. Note that + converts undefined to "undefined" prior to gluing it to There are . Note too that finding and fixing coding typos like this are what debugging primarily entails. var dough = { pastryFlour: [1 + 3/4, "cup"], almondFlour: [1/3, "cup"], saigonCinnamon: [1, "tsp"], mincedLemonZest: [2, "tsp"], seaSalt: [1/4, "tsp"], soda: [1, "tsp"], tartar: [1, "tsp"], pourableVanillaYogurt: [1, "cup"], egg: [1], wildBlueberries: [1 + 1/4, "cup"] }; dough.wildBlueberries *= 3; "There are " + dough.wildBlueberries[0] + " cups of wild blueberries in the dough."; // "There are undefined cups of wild blueberries in the dough."

In the world of LEGO robotics, pneumatics are among the great mysteries to many robot teams. Since so many people either don t understand their potential, or maybe just are not aware of their existence, these parts rarely get used on LEGO robotics projects. Pneumatics refers to the use of pressurized gas (in LEGO, that gas is air) to create a mechanical motion. Pneumatics give the robot another power source of manipulation besides LEGO NXT servos. Many times, a team will find that it needs an extra powered attachment that can t be created using the robot s existing attachment servo. Maybe the servo is being used for other attachments, or its location on the robot chassis doesn t work for the attachment idea that the team has in mind for a particular mission. The LEGO pneumatics can give a team this extra source of power for that attachment. LEGO pneumatics are also very strong; tasks that may cause a mechanized attachment with gears to slip, such as heavy lifting, can be done with pneumatics much easier. Pneumatics are not for everyone, and I advise against using them just for the sake of having them on the robot. If you do use them, be sure to understand why you chose to do so, and be ready to explain this to the technical judges. In this chapter, we will talk about the how each of the components work in the system.

Similarly, using the SetAttribute method of the XElement class we can change the value of the specified attribute. (See Listing 3-23.)

Figure 3 5. JavaScript converts NaN to a wrapper object if you query it with the . or [] operator. Finally, it s vital to remember that the left operand to +=, -=, *=, or /= must be a variable, member, element, or parameter. Otherwise, JavaScript will slap you upside the head by returning a SyntaxError noting, "invalid assignment left-hand side", which means the left operand must be one of these things. 3 -= 1; // SyntaxError: invalid assignment left-hand side { message="invalid assignment left-hand side" } "blue" += "berries"; // SyntaxError: invalid assignment left-hand side { message="invalid assignment left-hand side" }

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