Tutorial by Examples: f

By default the state of a promise is pending when it is created. The state of a promise is changed when the deferred object which created the promise either resolves/rejects it. var deferred = new $.Deferred(); var d1= deferred.promise({ prop: "value" }); var d2= $("div"...

public class Foobar { public static void main(String[] args) { // example: Boolean ignore = null; if (ignore == false) { System.out.println("Do not ignore!"); } } } The pitfall here is that null is compared to false. Since w...

Here is an example of custom UITextField that takes only numerical text and discards all other. NOTE: For iPhone it is easy to do this using Number type keyboard, but for iPad there is no keyboard with Numbers only class NumberTextField: UITextField { required init(coder aDecoder: NSCoder) ...

If we want to disable all the actions like Copy, Paste, Replace, Select, etc from UITextField then we can use following custom text field: class CustomTextField: UITextField { var enableLongPressActions = false required init(coder aDecoder: NSCoder) { super.init(coder: aDecoder)! } o...

%TYPE: Used to declare a field with the same type as that of a specified table's column. DECLARE vEmployeeName Employee.Name%TYPE; BEGIN SELECT Name INTO vEmployeeName FROM Employee WHERE RowNum = 1; DBMS_OUTPUT.PUT_LINE(vEmp...

Parameter TypesReturn TypeInterface()voidRunnable()TSupplier()booleanBooleanSupplier()intIntSupplier()longLongSupplier()doubleDoubleSupplier(T)voidConsumer<T>(T)TUnaryOperator<T>(T)RFunction<T,R>(T)booleanPredicate<T>(T)intToIntFunction<T>(T)longToLongFunction<T>(...

You can define a function to be recursive with the rec keyword, so it can call itself. # let rec fact n = match n with | 0 -> 1 | n -> n * fact (n - 1);; val fact : int -> int = <fun> # fact 0;; - : int = 1 # fact 4;; - : int = 24 You can also define mutually re...

Simple extract of index.html: <div class="sign-in"> {% if user %} [Passing the url we have the opportunity to logout the user] <a href="{{ url|safe }}">LOG OUT</a> [You can include here operations for user authenticated] ...

Assume that, we implement a simple API and we have the following models. class Parent(models.Model): name = models.CharField(max_length=50) class Child(models.Model): parent = models.ForeignKey(Parent) child_name = models.CharField(max_length=80) And we want to return a respo...

DirectByteBuffer is special implementation of ByteBuffer that has no byte[] laying underneath. We can allocate such ByteBuffer by calling: ByteBuffer directBuffer = ByteBuffer.allocateDirect(16); This operation will allocate 16 bytes of memory. The contents of direct buffers may reside outside ...

copy (select oid,relname from pg_class limit 5) to stdout;

This covers how you can create a basic 2D game using SurfaceView. First, we need an activity: public class GameLauncher extends AppCompatActivity { private Game game; @Override public void onCreate(Bundle sis){ super.onCreate(sis); game = new Game(GameLauncher....

Prerequisites: Java is installed Selenium is extracted in a folder (Contains 2 files, and 1 folder) Follow these steps to set up IntelliJ Idea for Selenium. Click On "New Project". Choose Java < "Hello World" Application Type the name of the Project, and create it....

To get the attribute of a WebElement, we use getAttribute on that WebElement. For example, consider the following html tag <a id="click" href="https://www.google.com"> We can find the Element's href attribute by WebElement e = driver.findElement(By.id("click&quot...

`To calculate 1D convolution by hand, you slide your kernel over the input, calculate the element-wise multiplications and sum them up. The easiest way is for padding=0, stride=1 So if your input = [1, 0, 2, 3, 0, 1, 1] and kernel = [2, 1, 3] the result of the convolution is [8, 11, 7, 9, 4], whic...

Creating a LUIS Model requires little to no programming experience. However, you need to be familiar with 2 important terms that will be used extensively. Intents - These are how you identify functions that need to be executed when the user types in something. Eg - An intent named Hi will identif...

What Are Notification Channels? Notification channels enable us app developers to group our notifications into groups—channels—with the user having the ability to modify notification settings for the entire channel at once. For example, for each channel, users can completely block all notifications...

The following permissions are required to use the Bluetooth APIs: android.permission.BLUETOOTH android.permission.BLUETOOTH_ADMIN If you're targeting devices with Android 6.0 (API Level 23) or higher and want to perform scanning/advertising operations you will require a Location permission: a...

Once you are connected to a Gatt Server, you're going to be interacting with it by writing and reading from the server's characteristics. To do this, first you have to discover what services are available on this server and which characteristics are avaiable in each service: @Override public voi...

You can request to be notified from the Gatt Server when the value of a characteristic has been changed: gatt.setCharacteristicNotification(characteristic, true); BluetoothGattDescriptor descriptor = characteristic.getDescriptor( UUID.fromString("00002902-0000-1000-8000-00805f9b34fb&quot...