L. Lovász (auth.), Wilfried Brauer (eds.)'s Automata, Languages and Programming: 12th Colloquium PDF

By L. Lovász (auth.), Wilfried Brauer (eds.)

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Read or Download Automata, Languages and Programming: 12th Colloquium Nafplion, Greece, July 15–19, 1985 PDF

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Extra info for Automata, Languages and Programming: 12th Colloquium Nafplion, Greece, July 15–19, 1985

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This reverse assignment is called decomposition: var (errorCode:Int, errorDescription:String) = webError Since tuples are not arrays or dictionary objects, they cannot be accessed using indices, sequences, or associates. 1)") Named access to tuple members It is not always very easy to use the sequential members to access tuples. 1, this is where named members make the access easier. code // returns the error code Strings Working with strings is also quite easy in Swift. Like arrays, strings can be iterated using a for loop: var testing = "This is a test" for char in testing { println("The char is \(char)") } [ 37 ] Playgrounds Appending strings The + and += operators can be used to concatenate strings: var strSmall = "Small " strSmall = strSmall + "string " strSmall += "with added text" Formatting strings Like the println function, strings can be formatted and stored in strings instead of using them for printing: var theStr = "The test string" var length = countElements(theStr) var strRes = "The length of \(theStr) is \(length)" println(strRes) Any and AnyObject Any needs to be mentioned, as it is a type that matches any of the types.

If we did not use the convenience keyword, the compiler would complain thinking we are redefining the function with a new signature: var stooge3 = Stooge("Moe", 1934) The properties in this class, name and firstAppear, are both directly accessible. You could also define setters and getters that could be used to set the values as required. firstAppear)") // Prints 1934 // Prints 1967 [ 53 ] Playgrounds If you want to run some code before a value is set or after a value is set, Swift offers the willSet and the didSet functions like the get and set.

In such a scenario, you can use the fallthrough keyword. By default, the code exits the switch block and does not check the next case, with fallthrough, the statements for the next case are also executed, irrespective of the match, as shown here: switch aScore{ case (_, "Temple Bun"): println("Wow, I could never score on this game") fallthrough case ( 100, _): println("Yay! 1)") default: println("All play makes Jack a dull boy") } Now, we will see both the messages, "Wow, I could…" and "Yay! You are a …".

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