zxing.net qr code reader WORKING WITH LISTS AND RECORDS in Objective-C

Printing QR in Objective-C WORKING WITH LISTS AND RECORDS

CHAPTER 6 WORKING WITH LISTS AND RECORDS
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The is contained by operator checks whether the left operand is contained by the list in the right operand. Here s an example: {1, 2} is contained by {1, 2, 3} Result: true {"a", "c"} is contained by {"a", "b", "c"} Result: false {1, 2} is contained by {1, 2, 3} Result: true "treasure" is in (words of "treasure chest") Result: true --the actual test is: {"treasure"} is in {"treasure", "chest"} As you can see, you can use the term is in instead of is contained by.
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More Uses for Containment Operators
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Although you will study if statements in much more detail in 9, I wanted to explain here how using lists can make certain if statements simpler. Sometimes you will want to perform an operation only if a variable has a specific value. This is an easy comparison: if the_variable = "this value" then --do something end if What if, however, the variable can be one of several values For instance, what if you want to perform an operation only on weekends The traditional form may look like the following, with a compound if statement separated by the or operator: if the_weekday is Saturday or the_weekday is Sunday then --do something end if Although this is still manageable, imagine if the value could be a choice of 10 to 20 items. This starts to get difficult lots of or substatements that can be really tricky to manage. The solution is to replace all the is equal operations and their connecting or tests with a single is in test, like this: if the_weekday is in {Saturday, Sunday} then --do something end if Not only is this code simpler to read, but it s also easier to modify later if you need to add and remove items from the list in order to change the conditions. Here are a few more examples see whether you can spot which one has the counterintuitive result: {2, 4} is in {1, 5, 2, 4, 3, 0} --> true {2, 4} is in {{1, 5}, {2, 4}, {3, 0}} --> false {{2, 4}} is in {{1, 5}, {2, 4}, {3, 0}} --> true The second example is a good reminder that AppleScript s containment operators actually check for a matching range, not a single item. This doesn t matter most of the time, but it can catch you when working with lists of lists unless you re careful.
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CHAPTER 6 WORKING WITH LISTS AND RECORDS
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Using Commands That Produce a List
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Asking for multiple elements of an application object or AppleScript value generally returns a list. A simple example of that is as follows: get characters of "abc" Result: {"a", "b", "c"} Although I will discuss this in much more detail in later chapters that deal with scripting applications, here are a few examples: tell application "Finder" set big_file_name_list to name of every file of folder x whose size > 10000 end tell The result is a list, each item of which is a string containing a filename. All filenames in the list belong to files larger than 10KB. Applications can also return lists of references to objects, not only values such as numbers and text. Figure 6-7 shows how InDesign returns a list of references to text frames.
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Figure 6-7. Despite its apparent size, the list contains only six items. Another common command that returns a list is the list folder command. This command is a part of Standard Additions, and its purpose is to return a list containing the name of every file and folder in the specified folder. As shown in Figure 6-8, the list folder command returns a list of filenames only, not the whole path. To do something with the files in the following statements, you have to concatenate the folder path to each of the filenames in the list.
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