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Figure 4 17. Replacing a for in sloth with a for gazelle Now that you know how to replace a for in sloth with a for, while, or do while gazelle, let s explore a couple of ways to make those three snappier. Let s begin with our for loop from the previous sample. First, JavaScript can query local variables within a function or global variables outside of a function faster than object members such as length like two times as fast in Explorer 7 and 8. So, rather than query length over and over in the boolean expression, i < rocketRichard.length, let s do so one time in the initialization expression, replacing i = 0 with i = rocketRichard.length. Second, it s faster to iterate over an array in reverse because doing so provides a way to combine the boolean expression with the increment or decrement expression. Therefore, omit the latter, and decrement the loop variable i in the boolean expression. In turn, since we are now iterating over the array in reverse, we need to tweak the function literal we pass to sort() so that rocketRichard is ordered from fewest to most goals and then from Z to A. Make the following changes, click Run, and then verify your work with Figure 4 18: var topTwenty = { "Crosby": 49, "Ovechkin": 48, "Stamkos": 48, "Marleau": 43, "Gaborik": 41, "Kovalchuk": 40, "Heatley": 39,

Figure 1-24. The output for Listing 1-34

Keeping track of programs is always a struggle for teams. It s easy to just write the code, test it, and then move forward. While you re writing your programs, it s easy to remember what they do, but after a few weeks, keeping track of what each program does is a bit harder. So it is important to document the programs while their logic is still fresh in your mind. This documentation will also help when other team members need to make changes or just understand what each program is doing when they are working on the robot. Having all team members familiar with the programs is important even if every person was not involved with programming a particular mission or task of the robot.

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"Semin": 39, "Parise": 37, "Burrows": 35, "Kopitar": 34, "Ryan": 34, "Carter": 33, "Nash": 33, "Iginla": 32, "Penner": 32, "Backstrom": 31, "Hornqvist": 30, "Jokinen": 30, "Kane": 30 } var rocketRichard = ["Ovechkin", "Crosby", "Marleau", "Stamkos"], note = ""; rocketRichard.sort(function(p1, p2) { var d = topTwenty[p1] - topTwenty[p2]; if (d !== 0) { return d; } else { return (p2 < p1) -1 : 1; } }); for (var i = rocketRichard.length; i --; ) { note = note + rocketRichard[i] + ": " + topTwenty[rocketRichard[i]] + ", "; } note.slice(0, -2); // "Crosby: 49, Ovechkin: 48, Stamkos: 48, Marleau: 43" Note that in i --, the -- operator is in the post-decrement position. Why does that matter It matters for a couple of reasons. For one thing, if you wrote -- i instead of i --, JavaScript would never query the fourth element in rocketRichard. For another, if rocketRichard were empty, which is to say its length was 0, then our for loop would never stop iterating. So, be sure that -- is in the post-decrement position!

<Extension> _ Public Shared Function [Single](Of T)(ByVal source As IEnumerable(Of T), _ ByVal predicate As Func(Of T, Boolean)) As T <Extension> _ Public Shared Function SingleOrDefault(Of T)(ByVal source As IEnumerable(Of T)) As T <Extension> _ Public Shared Function SingleOrDefault(Of T)(ByVal source As IEnumerable(Of T), _ ByVal predicate As Func(Of T, Boolean)) As T

Figure 4 18. Snappier for loop Alright, now let s try rewriting our snappy for loop as an equally snappy while loop. Just move the initialization of i to rocketRichard.length to a separate statement prior to the while loop, and decrement i in the boolean expression. Make those two quick edits like so, and click Run: var topTwenty = { "Crosby": 49, "Ovechkin": 48, "Stamkos": 48, "Marleau": 43, "Gaborik": 41, "Kovalchuk": 40, "Heatley": 39, "Semin": 39, "Parise": 37, "Burrows": 35, "Kopitar": 34, "Ryan": 34, "Carter": 33,

One of the easiest ways to document your program is to add descriptive comments as you write the code. In NXT-G, it s simple to add these comments in each program using the Comment tool in the NXT-G software. The Comment tool is accessed in the NXT-G tool bar with the cartoon bubble shape shown in Figure 13 1.

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