Tutorial by Examples: e

By default, npm installs the latest available version of modules according to each dependencies' semantic version. This can be problematic if a module author doesn't adhere to semver and introduces breaking changes in a module update, for example. To lock down each dependencies' version (and the ve...

There are two ways to create object mocked by Mockito: via annotation via mock function Via annotation: With a JUnit test runner: @RunWith(MockitoJUnitRunner.class) public class FooTest { @Mock private Bar barMock; // ... } You can also use Mockito's JUnit @Rule, which...

Mockito.when(mock.returnSomething()).thenReturn("my val"); mock.returnSomething(); // returns "my val" mock.returnSomething(); // returns "my val" again mock.returnSomething(); // returns "my val" again and again and again... If you want different valu...

There have been many releases of Java since the original Java 1.0 release in 1995. (Refer to Java version history for a summary.) However most releases have passed their official End Of Life dates. This means that the vendor (typically Oracle now) has ceased new development for the release, and n...

One method for creating recursive lambda functions involves assigning the function to a variable and then referencing that variable within the function itself. A common example of this is the recursive calculation of the factorial of a number - such as shown in the following code: lambda_factorial ...

Firstly you have to add Xamarin.Android.Support.V7.AppCompat library for NuGet: https://www.nuget.org/packages/Xamarin.Android.Support.v7.AppCompat/ In the "values" folder under "Resources" add new xml file called "styles.xml": "styles.xml" file should co...

Input record separator can be specified with -0 switch (zero, not capital O). It takes an octal or hexadecimal number as value. Any value 0400 or above will cause Perl to slurp files, but by convention, the value used for this purpose is 0777. perl -0777 -e 'my $file = <>; print length($file)...

In order to start using Sequelize, you must first install the Sequelize package using the Node Package Manager (npm). Install sequelize module Add --save option to store module in package.json npm install sequelize Next, depending on which database system you wish to use with Sequelize, instal...

Sometimes it's useful to check if a field is present or absent on your JSON to avoid some JSONException on your code. To achieve that, use the JSONObject#has(String) or the method, like on the following example: Sample JSON { "name":"James" } Java code String jsonStr...

Java release naming is a little confusing. There are actually two systems of naming and numbering, as shown in this table: JDK versionMarketing namejdk-1.0JDK 1.0jdk-1.1JDK 1.1jdk-1.2J2SE 1.2......jdk-1.5J2SE 1.5 rebranded Java SE 5jdk-1.6Java SE 6jdk-1.7Java SE 7jdk-1.8Java SE 8jdk-91Java SE 9 (n...

Bootstrap provides multiple classes for styling buttons and making them stand out. Bootstrap buttons can be created by adding the .btn class to an element. Bootstrap ClassRole (color).btn-defaultStandard button (white).btn-primaryProvides extra visual weight and identifies the primary action (blue...

I won't explain what Any and FirstOrDefault does because there are already two good example about them. See Any and First, FirstOrDefault, Last, LastOrDefault, Single, and SingleOrDefault for more information. A pattern I often see in code which should be avoided is if (myEnumerable.Any(t=>t.Fo...

public string GetCustomerNamesCsv() { List<CustomerData> customerDataRecords = GetCustomerData(); // Returns a large number of records, say, 10000+ StringBuilder customerNamesCsv = new StringBuilder(); foreach (CustomerData record in customerDataRecords) { custom...

With regards to reserved words there is a small distinctions between the "Identifiers" used for the likes of variable or function names and the "Identifier Names" allowed as properties of composite data types. For example the following will result in an illegal syntax error: va...

In order to play a sound using the SoundEffect type, create a variable to hold the loaded sound. Typically this would be an instance variable in the Game class: private SoundEffect mySound; Then, in the LoadContent() method of the Game class: protected override void LoadContent() { // l...

In order to generate an RSA key, an EVP_PKEY must first be allocated with EVP_PKEY_new: EVP_PKEY *pkey; pkey = EVP_PKEY_new(); An exponent for the key is also needed, which will require allocating a BIGNUM with BN_new and then assigning with BN_set_word: BIGNUM *bn; bn = BN_new(); BN_set_wor...

An EVP_PKEY can be saved directly to disk in a several formats. PEM_write_PrivateKey is used to save EVP_PKEY in a PEM format: FILE *f; f = fopen("key.pem", "wb"); PEM_write_PrivateKey( f, /* use the FILE* that was opened */ pkey, /* EV...

To load a private key directly from disk, use the PEM_read_PrivateKey function: FILE *f; EVP_PKEY *pkey; f = fopen("key.pem", "rb"); PEM_read_PrivateKey( f, /* use the FILE* that was opened */ &pkey, /* pointer to EVP_PKEY structure */ NULL, /* passwor...

In most cases all data that is accessed by several threads should be initialized before the threads are created. This ensures that all threads start with a clear state and no race condition occurs. If this is not possible once_flag and call_once can be used #include <threads.h> #include &lt...

Basic Text Email <?php $mail = new PHPMailer(); $mail->From = "[email protected]"; $mail->FromName = "Full Name"; $mail->addReplyTo("[email protected]", "Reply Address"); $mail->Subject = "Subject Text"; $mail->Body ...