integrate barcode scanner into asp net web application IMPLEMENTING HEALTHY SCRIPTWRITING PRACTICES in Objective-C

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CHAPTER 25 IMPLEMENTING HEALTHY SCRIPTWRITING PRACTICES
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But man, you can seem much dumber to yourself when you can t understand your own code, which happens quite often. Another important type of comment is one that dates itself. Every time I return to an old script and make an adjustment, I comment out a copy of the old code and add a visible comment such as this: -- -- Changed by Hanaan on 4/12/2006. Reason: include date in -- report file name. This leaves a trail of evidence for what was part of the original script and what other statements were added later. Another important use of comments is in documenting handlers. If you consider that writing handlers is adding your own commands to the mix commands that potentially require specific parameters, perform an action, and/or return a result documenting these items is more than preferred. For example: --------This handler gets data from an Excel file. The handler will open the given file, get the data from the given sheet and close the file. The result is a list of Excel data taken from the worksheet Parameters: filePath (alias): the path to the Excel file sheetName (string): The name of the worksheet to get the data from. closeFile (boolean): true will close file after getting the data.
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In addition, when updating the script, you should make sure to update any related notes to make sure they re still correct.
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Literal Expressions Can Bring You Down (Dramatization)
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Even if you re certain a specific value in your script will never change, you should still not embed it directly into the operations or statements in which it is used. This will make your scripts much less debugging friendly. Instead, just before the operation the value is used in, assign it to a descriptive variable name. For instance, instead of writing this: set daysWorked to hoursWorked / 8 write the following: set workHoursInWorkday to 8 set daysWorked to hoursWorked / workHoursInWorkday The second version is longer but is easier to read, and if the value has to change, you can find it and update it much easier.
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Enhancing Performance
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John Thorsen of TECSoft, the original AppleScript training company (www.tecsoft.com), claims that the value AppleScript automation adds to any workflow is so drastic that the actual speed in which the script runs doesn t really matter. After all, does it really matter whether the process that used to take 3 hours now takes 20 seconds or 30 seconds
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CHAPTER 25 IMPLEMENTING HEALTHY SCRIPTWRITING PRACTICES
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Although this is true, some scripts do need to perform as fast as possible, since after a while, people start comparing how fast they are in relation to other scripts, not how fast the manual process was. People forget quickly . . . . For instance, a script that processes jobs in a queue can process that many more jobs an hour if it runs faster. The following sections highlight some issues you should consider when trying to speed up your scripts.
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OS X, Baby!
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If you re still limping along with OS 9, you are running scripts slower than you could. I know that there are many other considerations for upgrading the operating system, but if you re looking for reasons to upgrade, then you should know that, because of the tighter integration of AppleScript in the OS, your scripts are likely to run faster on OS X.
Writing More Efficient Code
A few simple design techniques can help speed up your code.
Adding Items to Lists
When you have a list and you want to add an item to it at the end, you can do it in two ways. This is one way: set the_list to the_list & the_item This is the other way: set end of the_list to the_item Since adding items to a list usually happens multiple times inside a repeat loop, it is important to realize the implication of the method you choose. In the first way, adding items will take a bit more time since AppleScript needs to create a completely new list each time. The second method, where you tack on items to the end of the existing list, allows you to add items to a long list much more quickly, so you should favor this method.
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