Tutorial by Examples: w

A common thought pattern for inexperienced Java programmers is that exceptions are "a problem" or "a burden" and the best way to deal with this is catch them all1 as soon as possible. This leads to code like this: .... try { InputStream is = new FileInputStream(fileName);...

To search for text foo within a {} block surrounding the cursor use the following command (<ESC> - escape key, <CR> - enter key) : vi{<ESC>/\%Vfoo<CR> now you can jump between the matches within the block by pressing n and p. If you have hlsearch option enabled this will ...

Inspired by PowerShell: Function doesn't have proper return value function bar { [System.Collections.ArrayList]$MyVariable = @() $MyVariable.Add("a") | Out-Null $MyVariable.Add("b") | Out-Null $MyVariable } The Out-Null is necessary because the .NET ArrayLis...

(paraphrased from about_return) The following methods will have the same values on the pipeline function foo { $a = "Hello" return $a } function bar { $a = "Hello" $a return } function quux { $a = "Hello" $a }

Install webpack-dev-server via npm. npm i -D webpack-dev-server Configure webpack-dev-server by adding server.js. // server.js var webpack = require("webpack"); var WebpackDevServer = require("webpack-dev-server"); var config = require("./webpack.dev.config...

Inline display elements, usually such as span or a, will include up to one white-space character before and after them in the document. In order to avoid very long lines in the markup (that are hard to read) and unintentional white-space (which affects formatting), the white-space can be commented o...

build.gradle: dependencies { compile 'com.android.support:appcompat-v7:23.3.0' compile 'com.jakewharton.rxbinding:rxbinding-appcompat-v7:0.4.0' } menu/menu.xml: <menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.c...

Since the release of Gradle 2.2, the use of the android-apt plugin is no longer used. The following method of setting up Dagger 2 should be used. For older version of Gradle, use the previous method shown below. For Gradle >= 2.2 dependencies { // apt command comes from the android-apt plu...

First of all you need Uri and temp Folders and request codes : public final int REQUEST_SELECT_PICTURE = 0x01; public final int REQUEST_CODE_TAKE_PICTURE = 0x2; public static String TEMP_PHOTO_FILE_NAME ="photo_"; Uri mImageCaptureUri; File mFileTemp; Then init mFileTemp : public ...

One of the use cases of callback URLs is OAuth. Let us do this with an Instagram Login: If the user enters their credentials and clicks the Login button, Instagram will validate the credentials and return an access_token. We need that access_token in our app. For our app to be able to listen to suc...

OLDPWD (OLDPrintWorkingDirectory) contains directory before the last cd command: ~> $ cd directory directory> $ echo $OLDPWD /home/user

PWD (PrintWorkingDirectory) The current working directory you are in at the moment: ~> $ echo $PWD /home/user ~> $ cd directory directory> $ echo $PWD /home/user/directory

ssh -p 21 [email protected] <<EOF echo 'printing pwd' echo "\$(pwd)" ls -a find '*.txt' EOF $ is escaped because we do not want it to be expanded by the current shell i.e $(pwd) is to be executed on the remote shell. Another way: ssh -p 21 [email protected] <...

sudo -s <<EOF a='var' echo 'Running serveral commands with sudo' mktemp -d echo "\$a" EOF $a needs to be escaped to prevent it to be expanded by the current shell Or sudo -s <<'EOF' a='var' echo 'Running serveral commands with sudo' mktemp -d e...

Inside your layout, add a Login button with the following code: <com.twitter.sdk.android.core.identity.TwitterLoginButton android:id="@+id/twitter_login_button" android:layout_width="wrap_content" android:layout_height="wrap_content" and...

Things you need A paid Apple Developer Program Membership A valid App ID and identifier for you app (like com.example.MyApp) which is not used before anywhere Access to developer.apple.com and Member Center An iOS Device to test (as Push Notifications don't work on Simulator) Enabling t...

Windows in SFML are represented by one of two classes: sf::Window is a generic window provided by the operating system including an OpenGL render context. sf::RenderWindow is a specialized version of sf::Window that also acts as a sf::RenderTarget, allowing SFML's primitives to be rendered to it...

On systems using systemd, such as Fedora => 15, Ubuntu (Server and Desktop) >= 15.04, and RHEL/CentOS >= 7: systemctl status [servicename] ...where [servicename] is the service in question; for example, systemctl status sshd. This will show basic status information and any recent errors ...

Entity Framework exposes abstraction classes that are used to interact with underlying databases in the form of classes like DbContext. These contexts generally consist of DbSet<T> properties that expose the available collections that can be queried : public class ExampleContext: DbContext ...

The zip function accepts 2 parameters of type SequenceType and returns a Zip2Sequence where each element contains a value from the first sequence and one from the second sequence. Example let nums = [1, 2, 3] let animals = ["Dog", "Cat", "Tiger"] let numsAndAnimals ...