Tutorial by Examples: co

Converting (Parsing) a String to a Date

If you know the format of the string you are converting (parsing) you should use DateTime.ParseExact Dim dateString As String = "12.07.2003" Dim dateFormat As String = "dd.MM.yyyy" Dim dateValue As Date dateValue = DateTime.ParseExact(dateString, dateFormat, Globalization.C...

Converting a Date To A String

Simply use the .ToString overload of a DateTime object to get the format you require: Dim dateValue As DateTime = New DateTime(2001, 03, 06) Dim dateString As String = dateValue.ToString("yyyy-MM-dd") '2001-03-06

Calling a Tcl command from an expression

Sometimes you need to call a Tcl command from your expression. For example, supposing you need the length of a string in it. To do that, you just use a [...] sequence in the expression: set halfTheStringLength [expr { [string length $theString] / 2 }] You can call any Tcl command this way, but i...

D3.js component with ReactJS

This example is based on a blog post by Nicolas Hery. It utilizes ES6 classes and ReactJS's lifecycle methods to keep the D3 component updated d3_react.html <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Hello, d3React!</title>...

Commit ancestry chain: ^, ~, etc.

$ git reset --hard HEAD^ # discard last commit $ git rebase --interactive HEAD~5 # rebase last 4 commits A suffix ^ to a revision parameter means the first parent of that commit object. ^<n> means the <n>-th parent (i.e. <rev>^ is equivalent to <rev>^1). A...

Youngest matching commit: ^{/}, :/

$ git show HEAD^{/fix nasty bug} # find starting from HEAD $ git show ':/fix nasty bug' # find starting from any branch A colon (':'), followed by a slash ('/'), followed by a text, names a commit whose commit message matches the specified regular expression. This name returns the younge...

Code Folding Preferences

It is possible to change Code Folding preference to suit your need. Thus code folding can be set enable/unable for specific constructs (ex: if block, for loop, Sections ...). To change folding preferences, go to Preferences -> Code Folding: Then you can choose which part of the code can be f...

Directly including JavaScript code

Instead of linking to an external file, you can also include the JS code as-is in your HTML: <script> // JavaScript code </script>

Compiling on Ubuntu

To build vim from source on Ubuntu: Get a copy of the source code by downloading from the official Vim repository on GitHub. Get the dependencies by running $ sudo apt-get build-dep vim-gnome or similar. Go to the directory of the Vim source code: cd vim/src Run $ ./configure. You can customiz...

Copying a file using Channel

We can use Channel to copy file content faster. To do so, we can use transferTo() method of FileChannel . import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.nio.channels.FileChannel; public class FileCopier { ...

UITapGestureRecognizer (Double Tap)

The double tap, like a single tap, also uses the UITapGestureRecognizer. You simply set the numberOfTapsRequired to 2. Swift override func viewDidLoad() { super.viewDidLoad() // Double Tap let doubleTapGesture = UITapGestureRecognizer(target: self, action: #selector(handleDoubleTa...

UILongPressGestureRecognizer

The UILongPressGestureRecognizer lets you listen for a long press on a view. You can set the length of delay before the action method is called. Swift override func viewDidLoad() { super.viewDidLoad() // Long Press let longPressGesture = UILongPressGestureRecognizer(target: self, ...

UISwipeGestureRecognizer

Swipe gestures allow you to listen for the user moving their finger across the screen quickly in a certain direction. Swift override func viewDidLoad() { super.viewDidLoad() // Swipe (right and left) let swipeRightGesture = UISwipeGestureRecognizer(target: self, action: #selector(...

UIPinchGestureRecognizer

Pinches are a two fingered gesture where the fingers move closer or farther from each other. This gesture is generally used for resizing a view. Swift override func viewDidLoad() { super.viewDidLoad() // Pinch let pinchGesture = UIPinchGestureRecognizer(target: self, action: #sele...

UIRotationGestureRecognizer

Two fingers rotating around a center can be listened for with the UIRotationGestureRecognizer. This is generally used for rotating a view. Swift override func viewDidLoad() { super.viewDidLoad() // Rotate let rotateGesture = UIRotationGestureRecognizer(target: self, action: #selec...

Adding a Gesture recognizer in the Interface Builder

Drag a gesture recognizer from the object library onto your view. Control drag from the gesture in the Document Outline to your View Controller code in order to make an Outlet and an Action. Notes This example comes from this fuller sample project demonstrating gesture recognizers.

What is Bytecode?

Bytecode is the set of instructions used by the JVM. To illustrate this let's take this Hello World program. public static void main(String[] args){ System.out.println("Hello World"); } This is what it turns into when compiled into bytecode. public static main([Ljava/lang/String...

Basic Object Construction and Use

Objects come in their own class, so a simple example would be a car (detailed explanations below): public class Car { //Variables describing the characteristics of an individual car, varies per object private int milesPerGallon; private String name; private String color; ...

With paste command

# Process substitution with paste command is common # To compare the contents of two directories paste <( ls /path/to/directory1 ) <( ls /path/to/directory1 )

Scoping

set alpha 1 proc myproc {} { puts $alpha } myproc This code doesn't work because the two alphas are in different scopes. The command set alpha 1 creates a variable in the global scope (which makes it a global variable). The command puts $alpha is executed in a scope that is created ...

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