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In layout, perhaps more than in any other aspect of programming, the difference between communicating with the computer and communicating with human readers comes into play. The smaller part of the job of programming is writing a program so that the computer can read it; the larger part is writing it so that other humans can read it. In their classic paper Perception in Chess, Chase and Simon reported on a study that compared the abilities of experts and novices to remember the positions of pieces in chess (1973). When pieces were arranged on the board as they might be during a game, the experts memories were far superior to the novices . When the pieces were arranged randomly, there was little difference between the memories of the experts and the novices. The traditional interpretation of this result is that an expert s memory is not inherently better than a novice s but that the expert has a knowledge structure that helps him or her remember particular kinds of information. When new information corresponds to the knowledge structure in this case, the sensible placement of chess pieces the expert can remember it easily. When new information doesn t correspond to a knowledge structure the chess pieces are randomly positioned the expert can t remember it any better than the novice.
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31. Layout and Style
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A few years later, Ben Shneiderman duplicated Chase and Simon s results in the computer-programming arena and reported his results in a paper called Exploratory Experiments in Programmer Behavior (1976). Shneiderman found that when program statements were arranged in a sensible order, experts were able to remember them better than novices. When statements were shuffled, the experts superiority was reduced. Shneiderman s results have been confirmed in other studies (McKeithen et al. 1981, Soloway and Ehrlich 1984). The basic concept has also been confirmed in the games Go and bridge and in electronics, music, and physics (McKeithen et al. 1981). After I published the first edition of this book, Hank, one of the programmers who reviewed the manuscript commented that, I was surprised that you didn t argue more strongly in favor of a brace style that looks like this:
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I was surprised that you even included the brace style that looked like this:
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I thought that, with both Tony and me arguing for the first style, you d prefer that. I responded, You mean you were arguing for the first style, and Tony was arguing for the second style, don t you Tony argued for the second style, not the first. Hank responded, That s funny. The last project Tony and I worked on together, I preferred style #2, and Tony preferred style #1. We spent the whole project arguing about which style was best. I guess we talked one another into preferring each other s styles! This experience as well as the studies cited above suggest that structure helps experts to perceive, comprehend, and remember important features of programs. Given the variety of styles of layout and the tenacity with which programmers cling to their own styles, even when they re vastly different from other styles, it s easy to believe that the details of a specific method of structuring a program are much less important than the fact that the program is structured at all.
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7 KEY POINT
Layout as Religion
The importance to comprehension and memory of structuring one s environment in a familiar way has led some researchers to hypothesize that layout might harm an expert s ability to read a program if the layout is different from the scheme
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31. Layout and Style
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the expert uses (Sheil 1981, Soloway and Ehrlich 1984). That possibility, compounded by the fact that layout is an aesthetic as well as a logical exercise, means that debates about program formatting often sound more like religious wars than philosophical discussions. At a coarse level, it s clear that some forms of layout are better than others. The successively better layouts of the same code at the beginning of the chapter made that evident. This book won t steer clear of the finer points of layout just because they re controversial. Good programmers should be open-minded about their layout practices and accept practices proven to be better than the ones they re used to, even if adjusting to a new method results in some initial discomfort.
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