Tutorial by Examples: alv

Calling the function string InvoiceHtml = myFunction.RenderPartialViewToString("PartialInvoiceCustomer", ToInvoice); // ToInvoice is a model, you can pass parameters if needed Function to generate HTML public static string RenderPartialViewToString(string viewName, object model) { ...

The ?= operator is an extension that behaves like =, except that the assignment only occurs if the variable is not already set. x = hello x ?= world # $(x) will yield "hello"

val and var scala> val a = 123 a: Int = 123 scala> a = 456 <console>:8: error: reassignment to val a = 456 scala> var b = 123 b: Int = 123 scala> b = 321 b: Int = 321 val references are unchangeable: like a final variable in Java, once it has been initial...

public ActionResult PopulateFoods() { IEnumerable<Food> foodList = GetAll(); // Renders a partial view, which defines a section of a view that can be rendered inside another view. return PartialView("_foodTable", foodVms);; } Action methods typically retur...

ggplot(iris[iris$Species == "setosa",],aes(Sepal.Width)) + geom_density() Here, we are subsetting the dataframe before passing it to ggplot. It is a very useful tool derived from the data frame data structure. To make the code more readable, one can also use dplyr's filter: libr...

data: lv_temp type string. data: ls_temp type sy. data: lt_temp type table of sy.

data: gv_temp type string. data: gs_temp type sy. data: gt_temp type table of sy.

To create the serialVersionUID for a class in Kotlin you have a few options all involving adding a member to the companion object of the class. The most concise bytecode comes from a private const val which will become a private static variable on the containing class, in this case MySpecialCase: ...

public class CreateArrayWithValues { public static void main(String[] args){ // Initializes an array of Strings with values String[] myArray = {"this", "array", "has", "six", "initial", "values"}; System.out....

Rounding Values midway between two integers go toward the nearest even value. - round(4.5); val it = 4 : int - round(3.5); val it = 4 : int Truncation val it = 4 : int - trunc(4.5); val it = 4 : int - trunc(3.5); val it = 3 : int Floor and Ceiling - ceil(4.5); val it = 5 : int - f...

1. $_ : The default input and pattern-searching space. Example 1: my @array_variable = (1 2 3 4); foreach (@array_variable){ print $_."\n"; # $_ will get the value 1,2,3,4 in loop, if no other variable is supplied. } Example 2: while (<FH>){ chomp($_); # $_ re...

Swift 3 Serial Queue func serialQueues () { let serialQueue = DispatchQueue(label: "com.example.serial") //default queue type is a serial queue let start = Date () for i in 0...3 { //launch a bunch of tasks serialQueue.a...

var="hello" function foo(){ echo $var } foo Will obviously output "hello", but this works the other way around too: function foo() { var="hello" } foo echo $var Will also output "hello"

function foo() { local var var="hello" } foo echo $var Will output nothing, as var is a variable local to the function foo, and its value is not visible from outside of it.

Optionals type, which handles the absence of a value. Optionals say either "there is a value, and it equals x" or "there isn't a value at all". An Optional is a type on its own, actually one of Swift’s new super-powered enums. It has two possible values, None and Some(T), where ...

Example for a functional view to create an object. Excluding comments and blank lines, we need 15 lines of code: # imports from django.shortcuts import render_to_response from django.http import HttpResponseRedirect from .models import SampleObject from .forms import SampleObjectForm # vie...

Many watchOS apps (like Workout, Weather, Music, etc) have a main WKInterfaceTable or a set of buttons which are hooked up to another controller, similar to the navigation on iOS. This is called hierarchical view structure. To connect a button, Ctrl-Drag from the button to a controller, and select ...

Html.Partial returns a string on the other hand Html.RenderPartial returns void. Html.RenderPartial This method returns void and the result is directly written to the HTTP response stream. That means it uses the same TextWriter object used in the current webpage/template. For this reason, this me...

PHP exposes a number of so-called global variables which contain information about the HTTP request, such as $_POST, $_GET, $_FILES, $_SESSION, etc. The Request class contains a static createFromGlobals() method in order to instantiate a request object based on these variables: use Symfony\Componen...