Tutorial by Examples: u

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> </library> One can use the following code to build a DOM tree out of a St...

Considering the following document : <?xml version='1.0' encoding='UTF-8' ?> <library> <book id='1'>Effective Java</book> <book id='2'>Java Concurrency In Practice</book> <notABook id='3'>This is not a book element</notABook> </librar...

Method references make excellent self-documenting code, and using method references with Streams makes complicated processes simple to read and understand. Consider the following code: public interface Ordered { default int getOrder(){ return 0; } } public interface Valued&lt...

How to install the Android Debugging Bridge (ADB) to a Linux system with the terminal using your distro's repositories. Install to Ubuntu/Debian system via apt: sudo apt-get update sudo apt-get install adb Install to Fedora/CentOS system via yum: sudo yum check-update sudo yum install androi...

Given a file file.txt with the following content: line 1 line 2 line 3 You can add a new line using below command sed '/line 2/{x;p;x;}' file.txt The above command will output line 1 line 2 line 3 Explanation: x command is eXchange. sed has a buffer that you can use to store some ...

$ cat ip.txt address range substitution pattern sample Add Sub Mul Div Lines matching a pattern $ sed '/add/d' ip.txt range substitution pattern sample Add Sub Mul Div $ sed -n '/t/p' ip.txt substitution pattern $ sed -n '/[A-Z]/ s| |/|gp' ip.txt Add/Sub/Mul/Div ...

$ cat ip.txt address range substitution pattern sample Add Sub Mul Div Line number to line matching pattern $ sed -n '2,/pat/p' ip.txt range substitution pattern Line matching pattern to line number $ sed '/pat/,$d' ip.txt address range substitution GNU sed ...

General overview The background-size property enables one to control the scaling of the background-image. It takes up to two values, which determine the scale/size of the resulting image in vertical and and horizontal direction. If the property is missing, its deemed auto in both width and height....

Using The Terminal The examples in this document assume that you are using a POSIX-compliant (such as bash, sh, zsh, ksh) shell. Large portions of GNU/Linux functionality are achieved using the terminal. Most distributions of Linux include terminal emulators that allow users to interact with a...

ShortcutDescriptionCtrl + rsearch the history backwardsCtrl + pprevious command in historyCtrl + nnext command in historyCtrl + gquit history searching modeAlt + .use the last word of the previous commandrepeat to get the last word of the previous + 1 commandAlt + n Alt + .use the nth word of the pr...

ShortcutDescriptionCtrl + amove to the beginning of the lineCtrl + emove to the end of the lineCtrl + kKill the text from the current cursor position to the end of the line.Ctrl + uKill the text from the current cursor position to the beginning of the lineCtrl + wKill the word behind the current cur...

Converter between boolean and visibility. Get bool value on input and returns Visibility value. NOTE: This converter have already exists in System.Windows.Controls namespace. public sealed class BooleanToVisibilityConverter : IValueConverter { /// <summary> /// Convert bool or Nu...

Show how to create simple converter with parameter via property and then pass it in declaration. Convert bool value to Visibility. Allow invert result value by setting Inverted property to True. public class BooleanToVisibilityConverter : IValueConverter { public bool Inverted { get; set; } ...

Show how to create simple IMultiValueConverter converter and use MultiBinding in xaml. Get summ of all values passed by values array. public class AddConverter : IMultiValueConverter { public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { ...

Show how to create simple converter and use ConverterParameter to pass parameter to converter. Multiply value by coefficient passed in ConverterParameter. public class MultiplyConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, CultureInfo cult...

There are a few ways to determine the current shell echo $0 ps -p $$ echo $SHELL

If we want to get the x-cordinate of origin of the view, then we need to write like: view.frame.origin.x For width, we need to write: view.frame.size.width But if we add a simple extension to an UIView, we can get all the attributes very simply, like: view.x view.y view.width view.height...

If you use the paste command from your terminal emulator program, Vim will interpret the stream of characters as if they were typed. That will cause all kind of undesirable effects, particularly bad indendation. To fix that, from command mode: :set paste Then move on to insert mode, with i, for...

Even if third-party libraries are good, a simple way to parse the JSON is provided by protocols You can imagine you have got an object Todo as struct Todo { let comment: String } Whenever you receive the JSON, you can handle the plain NSData as shown in the other example using NSJSONSeria...

Instead of using the delegate pattern, that split the implementation in various part of the UIViewController class, you can even use closures to pass data back and forward. By assuming that you're using the UIStoryboardSegue, in the prepareForSegue method you can easily setup the new controller in ...