Tutorial by Examples: w

If the shift count value is a negative value then both left shift and right shift operations are undefined1: int x = 5 << -3; /* undefined */ int x = 5 >> -3; /* undefined */ If left shift is performed on a negative value, it's undefined: int x = -5 << 3; /* undefined */ I...

In the below example value in map $color-array is treated as list of pairs. SCSS Input $color-array:( black: #4e4e4e, blue: #0099cc, green: #2ebc78 ); @each $color-name, $color-value in $color-array { .bg-#{$color-name} { background: $color-value; } } ...

Due to very specific way of actor instantiation, injecting dependencies into an actor instance is not trivial. In order to intervene in actor instantiation and allow Spring to inject dependencies one should implement a couple of akka extensions. First of those is an IndirectActorProducer: import ak...

Specifying the -gui command line option when running an ANTLR grammar in the test rig will result in a window popping up with a visual representation of the parse tree. For example: Given the following grammar: JSON.g4 /** Taken from "The Definitive ANTLR 4 Reference" by Terence Parr */...

The presence of a tsconfig.json file indicates that the current directory is the root of a TypeScript enabled project. Initializing a TypeScript project, or better put tsconfig.json file, can be done through the following command: tsc --init As of TypeScript v2.3.0 and higher this will create t...

In Tcl, a control structure is basically just another command. This is one possible implementation of a do ... while / do ... until control structure. proc do {body keyword expression} { uplevel 1 $body switch $keyword { while {uplevel 1 [list while $expression $body]} u...

if expr1 ?then? body1 elseif expr2 ?then? body2 ... ?else? ?bodyN? exprN is an expression that evaluates to a boolean value. bodyN is a list of commands. set i 5 if {$i < 10} { puts {hello world} } elseif {$i < 70} { puts {enjoy world} } else { puts {goodbye world} } for sta...

2.1.3 1. Preview Different Devices There is a preview panel at the right of the android studio. In thispanel there is a button with device name with which you are previewing the UI of your app like this . Click on small dropdown indicator of this and a floating panel will appear with all the pr...

It forces you to explicitly declare all variables. What is the difference between explicitly declaring and implicitly declaring a variable? Explicitly declaring a variable: Dim anInteger As Integer = 1234 Implicitly declaring a variable: 'Did not declare aNumber using Dim aNumber = 1234 C...

Document level It is on by default, but you can have an extra layer of protection by placing Option Explicit On at the top of the code file. The option will apply to the whole document. Project level You can switch it on via the menu in Visual Studio: Project > [Project] Properties > Com...

Using the System.String.Replace method, you can replace part of a string with another string. string s = "Hello World"; s = s.Replace("World", "Universe"); // s = "Hello Universe" All the occurrences of the search string are replaced. This method can al...

The System.String class supports a number of methods to convert between uppercase and lowercase characters in a string. System.String.ToLowerInvariant is used to return a String object converted to lowercase. System.String.ToUpperInvariant is used to return a String object converted to upper...

Configure profiling for a project via stack. First build the project with the --profile flag: stack build --profile GHC flags are not required in the cabal file for this to work (like -prof). stack will automatically turn on profiling for both the library and executables in the project. The next...

To find out what packages your project directly depends on, you can simply use this command: stack list-dependencies This way you can find out what version of your dependencies where actually pulled down by stack. Haskell projects frequently find themselves pulling in a lot of libraries indirec...

By going to Settings >> Keymap A window will popup showing All the Editor Actions with the their name and shortcuts. Some of the Editor Actions do not have shortcuts. So right click on that and add a new shortcut to that. Check the image below

When a Google Map is displayed in lite mode clicking on a map will open the Google Maps application. To disable this functionality you must call setClickable(false) on the MapView, e.g.: final MapView mapView = (MapView)view.findViewById(R.id.map); mapView.setClickable(false);

A spring bean can be configured such that it will register only if it has a particular value or a specified property is met. To do so, implement Condition.matches to check the property/value: public class PropertyCondition implements Condition { @Override public boolean matches(ConditionC...

Say we have Products and Categorys in a many-to-many relationship: public class Product { public Product() { Categories = new HashSet<Category>(); } public int ProductId { get; set; } public string ProductName { get; set; } public virtual ICollection&lt...

Before starting with the example I'd recommend to create a Singleton with a delegate class member so you could achieve a use case of uploading a file in the background and let the user keep using your app while the files are being uploaded even when the app is the background. Let's start, first, we...

If all you need is to wrap the value into a promise, you don't need to use the long syntax like here: //OVERLY VERBOSE var defer; defer = $q.defer(); defer.resolve(['one', 'two']); return defer.promise; In this case you can just write: //BETTER return $q.when(['one', 'two']); $q.when ...