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

Printer QR Code JIS X 0510 in Objective-C WORKING WITH LISTS AND RECORDS

CHAPTER 6 WORKING WITH LISTS AND RECORDS
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Manipulating Lists
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To join two lists, use the concatenation operator, &: set new_list to {"A", "B"} & {1, 2, 3} --> {"A", "B", 1, 2, 3} To add a single item to the end of a list, use this statement: set new_list to {1, 2, 3} set end of new_list to 4 new_list --> {1, 2, 3, 4}
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Getting Items from a List
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You can get a single item from a list using the item s position in the list, as shown in Script 6-4. Script 6-4. set city_list to {"Boston", "Atlanta", "San Francisco"} set the_city to item 2 of city_list --> "Atlanta" first item of city_list --> "Boston" last item of city_list --> "San Francisco" item -1 of city_list --> "San Francisco" You can also get a range of items with the thru term. The result will be a list: set city_list to of {"Boston", "Atlanta", "San Francisco", "Providence", "Seattle"} set the_city to items 2 thru 4 of city_list --> {"Atlanta", "San Francisco", "Providence"}
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Using Comparison and Containment Operations with Lists
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You can compare two lists or a list with a possible list item: {1, 2, 3} contains 2 --> true {1, 2, 3} starts with 2 --> false {1, 2, 3} ends with 3 --> true
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Using Lists of Lists
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A list whose items are also lists is a list of lists: {{1, 2, 3}, {10, 20, 30}, {100, 200, 300}}
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Setting List Properties
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To get the list without the first item, use the rest property: rest of {"Atlanta", "San Francisco", "Providence"} Result --> {"San Francisco", "Providence"} The reverse property contains the same list in reverse order: reverse of {"Atlanta", "San Francisco", "Providence"} Result --> {"Providence", "San Francisco", "Atlanta"}
CHAPTER 6 WORKING WITH LISTS AND RECORDS
Using Records
A record is a list where each item has a descriptive label: {name: "Burt", age: 30, member: true} Record labels can t contain spaces; however, terms defined in an application s dictionary that have a space can be used as a record label in a record created by that application. You can t get a record s item by position, only by label: age of {name: "Burt", age: 30, member: true} --> 30
Comparing Records
You can check whether two records are equal: {name: "Burt", age: 30, member: true} = {age: 30, name: "Burt", member: true} --> true The preceding statement returns true because AppleScript puts no emphasis on the order of the properties in a record.
Using Containment Operators
You can check whether a record contains, or is contained by, another record. The following are a few examples: {name: "Burt", age: 30, member: true} contains {name: "Burt"} --> true {age: 30, name: "Burt"} is contained by {name: "Burt", age: 30, member: true} --> true
Concatenating Records
Concatenate records using the concatenation operator. {name: "Burt", age: 30, member: true} & {position: "President"} --> {name: "Burt", age: 30, member: true, position: "President"} If both operands contain the same property, then the property from the left operand will be used.
Coercing Records
A record can be coerced into a list, in which case the labels will be stripped: {name: "Burt", age: 30, member: true} as list --> {"Burt", 30, true}
CHAPTER
Giving Commands
f you had to choose a friend from ancient Greece, Socrates may be an interesting choice. You two could sit down for hours reflecting on and discussing the state of things. However, if you needed someone who could get things done someone in command you d probably want to move a few hundred years into the future to ancient Rome and consider someone like Julius Caesar. AppleScript is more like Caesar than like Socrates; it rules the Mac OS kingdom. When AppleScript talks, most statements it uses contain a command, and after stating most of those, it ll wait there until it gets a result. You use the AppleScript language to get results to get things done. And since AppleScript has no mouse or keyboard, it gets things done by giving commands.
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