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Note that rolling dough for scones or other pastries can be difficult. So if you re a budding doughie, I recommend buying a marble pastry board. Insofar as marble stays cooler than room temperature, it s easier to roll dough on. Anyway, say I d like to compare my guess at how much of an ingredient to add to the dough to what the recipe calls for. I could do so by way of the === identity operator. === returns true if its operands evaluate to identical values and false if not. That boolean verdict derives from the following protocol: If the values are of different types, return false. If both values are of the undefined type, return true. If both values are of the null type, return true. If both values are of the number type and one or both are NaN, return false. Otherwise, return true if the numbers are the same and false if not. If both values are of the string type and have the same sequence and number of characters, return true. Otherwise, return false. If both values are of the boolean type, return true if both are false or both are true. Otherwise, return false.

Figure 10 3. LEGO pneumatic pumps large ( left ) and small ( right )

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Did that final step go over your head Don t worry, we ll explore comparing memory addresses, which along with pointers are more generally referred to as references, in 5. For now just know that undefined, null, numbers, strings, and booleans are compared by value while objects, arrays, and functions are compared by memory address, which is to say by reference (which all implies that the two sets are stored in different ways, more of which in 5). Note that === does not do datatype conversion, but its predecessor, the == equality operator, does. Insofar as == can tell you whether only one expression is not entirely unlike another, savvy JavaScript programmers frown upon its use. So since you re a clean slate, I won t teach you bad habits here. Enough with the theory of ===; in Firebug, try the following sample, verifying your work with Figure 3 8: var dough = { pastryFlour: [1 + 2/3, "cup"], hazelnutFlour: [1/3, "cup"], butter: [3, "tbs"], sugar: [2, "tbs"], seaSalt: [1/4, "tsp"], soda: [1/2, "tsp"], tartar: [1, "tsp"], heavyWhippingCream: [1, "cup"], currants: [1/3, "cup"] }; dough.heavyWhippingCream[0] === 2/3; // false dough.currants[0] === dough.hazelnutFlour[0]; // true dough.hazelnutFlour[0] * 5 === dough.pastryFlour[0]; // true dough.soda[0] / dough.tartar[0] === 1; // false

The first person element is substituted with a new person, as shown in Figure 3-14.

Frequently you will want to test for inequality, which is to say for a value you don t want an expression to return. To do so, we might invert the boolean returned by === with the ! logical not operator. ! flips true to false and false to true. However, ! has 14 priority and === 9. To trump the 14 with the 9, we would wrap the === expression in the () grouping operator as the following sample and Figure 3 9 illustrate. var dough = { pastryFlour: [1 + 2/3, "cup"], hazelnutFlour: [1/3, "cup"], butter: [3, "tbs"], sugar: [2, "tbs"], seaSalt: [1/4, "tsp"], soda: [1/2, "tsp"], tartar: [1, "tsp"], heavyWhippingCream: [1, "cup"], currants: [1/3, "cup"] }; ! (dough.heavyWhippingCream[0] === 2/3); // true ! (dough.currants[0] === dough.hazelnutFlour[0]); // false ! (dough.hazelnutFlour[0] * 5 === dough.pastryFlour[0]); // false ! (dough.soda[0] / dough.tartar[0] === 1); // true

To store air for later use, a pneumatic air storage tank is available. The LEGO air tank will store the air as we compress it using the LEGO pneumatic pump. LEGO air pressure gauges are available, but for the most the most part, you can tell when the tank is getting full based on the effort required to push the pump. The tank has a hose connection on both ends: one will be used to attach the air pump and the second opening will be the output line connected to the air switch. Figure 10 4 shows a standard LEGO pneumatic air tank.

Figure 3-14. The output for Listing 3-24

Figure 3 9. Querying JavaScript as to whether two expressions are not equal As a shortcut for comparing two expressions for equality with === and flipping the verdict with !, JavaScript provides the !== operator. !== first runs through the === protocol and then does a logical not on the verdict. So if === would return true, !== returns false, and if === would false, !== returns true. So !== is quite the contrarian!

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