Tutorial by Examples: el

var arr = [1, 2, 3, 4]; Method 1 Creates a new array and overwrites the existing array reference with a new one. arr = []; Care must be taken as this does not remove any items from the original array. The array may have been closed over when passed to a function. The array will remain in mem...

Writes to the trace listeners in the Listeners collection when the application is compiled in debug configuration. public static void Main(string[] args) { Debug.WriteLine("Hello"); } In Visual Studio or Xamarin Studio this will appear in the Application Output window. This is d...

You can redirect the debug output to a text file by adding a TextWriterTraceListener to the Debug.Listeners collection. public static void Main(string[] args) { TextWriterTraceListener myWriter = new TextWriterTraceListener(@"debug.txt"); Debug.Listeners.Add(myWriter); Deb...

/** * The buildscript {} block is where you configure the repositories and * dependencies for Gradle itself--meaning, you should not include dependencies * for your modules here. For example, this block includes the Android plugin for * Gradle as a dependency because it provides the addition...

When you want to allow only certain keys in your arrays, especially when the array comes from request parameters, you can use array_intersect_key together with array_flip. $parameters = ['foo' => 'bar', 'bar' => 'baz', 'boo' => 'bam']; $allowedKeys = ['foo', 'bar']; $filteredParameters =...

This example assumes you've installed OCaml. Compiling OCaml Code Create a new file named hello.ml, with the following contents: print_string "Hello world!\n" ocamlc is the OCaml compiler. To compile and run this script, run $ ocamlc -o hello hello.ml and then execute the resulti...

We will see how to center content based on the height of a near element. Compatibility: IE8+, all other modern browsers. HTML <div class="content"> <div class="position-container"> <div class="thumb"> <img src="http://lorempix...

Given a file file.txt with the following content: line 1 line 2 line 3 You can delete a line from file content with the d command. The pattern to match is surrounded with default / delimiter and the d command follows the pattern: sed '/line 2/d' file.txt The above command will output: l...

To show a message box when the form has been shown: Public Class Form1 Private Sub Form1_Shown(sender As Object, e As EventArgs) Handles MyBase.Shown MessageBox.Show("Hello, World!") End Sub End Class To show a message box before the form has been shown: Public Cla...

From within a generator function, the control can be delegated to another generator function using yield*. function* g1() { yield 2; yield 3; yield 4; } function* g2() { yield 1; yield* g1(); yield 5; } var it = g2(); console.log(it.next()); // 1 console.log(it.next())...

for a large number of files which may need to be operated on in a similar process and with well structured file names. firstly a vector of the file names to be accessed must be created, there are multiple options for this: Creating the vector manually with paste0() files <- paste0("f...

#include <stdio.h> #define ARRLEN (10) int main (void) { int n[ ARRLEN ]; /* n is an array of 10 integers */ size_t i, j; /* Use size_t to address memory, that is to index arrays, as its guaranteed to be wide enough to address all of the possible availab...

Suppose you have this type: data Person = Person { name :: String, age:: Int } deriving (Show, Eq) and two values: alex = Person { name = "Alex", age = 21 } jenny = Person { name = "Jenny", age = 36 } a new value of type Person can be created by copying from alex, specif...

To delete persisted objects use delete(): session.delete(obj) Actual deletion from the database will happen on next flush.

There are many ways find the location of a value in an array. The following example snippets all assume that the array is one of the following: String[] strings = new String[] { "A", "B", "C" }; int[] ints = new int[] { 1, 2, 3, 4 }; In addition, each one sets...

Using ActiveCell or ActiveSheet can be source of mistakes if (for any reason) the code is executed in the wrong place. ActiveCell.Value = "Hello" 'will place "Hello" in the cell that is currently selected Cells(1, 1).Value = "Hello" 'will always place "Hello&...

The <algorithm> header provides a number of useful functions for working with sorted vectors. An important prerequisite for working with sorted vectors is that the stored values are comparable with <. An unsorted vector can be sorted by using the function std::sort(): std::vector<int&...

To create the classic "Hello, world" printing program, create a file called hello.d with a text editor containing the following code : import std.stdio; void main() { writeln("Hello, World!"); //writeln() automatically adds a newline (\n) to the output } Explanati...

Press Ctrl + v to enter into visual block mode. Use ↑ / ↓ / j / k to select multiple lines. Press Shift + i and start typing what you want. After you press Esc, the text will be inserted into all the lines you selected. Remember that Ctrl+c is not 100% equivalent to Esc and will not work in this...

You can bind to a property on a named element, but the named element must be in scope. <StackPanel> <CheckBox x:Name="MyCheckBox" IsChecked="True" /> <TextBlock Text="{Binding IsChecked, ElementName=MyCheckBox}" /> </StackPanel>