Tutorial by Examples: s

By default, the scope is public, the value can be accessed from anywhere. package com.example { class FooClass { val x = "foo" } } package an.other.package { class BarClass { val foo = new com.example.FooClass foo.x // <- Accessing a public value from anothe...

When the scope is private, it can only be accessed from the current class or other instances of the current class. package com.example { class FooClass { private val x = "foo" def aFoo(otherFoo: FooClass) { otherFoo.x // <- Accessing from another instance of the sam...

You can specify a package where the private value can be accessed. package com.example { class FooClass { private val x = "foo" private[example] val y = "bar" } class BarClass { val f = new FooClass f.x // <- Will not compile f.y // <- Wil...

The most restrictive scope is "object-private" scope, which only allows that value to be accessed from the same instance of the object. class FooClass { private[this] val x = "foo" def aFoo(otherFoo: FooClass) = { otherFoo.x // <- This will not compile, accessing x...

The protected scope allows the value to be accessed from any subclasses of the current class. class FooClass { protected val x = "foo" } class BarClass extends FooClass { val y = x // It is a subclass instance, will compile } class ClassB { val f = new FooClass f.x // <...

The package protected scope allows the value to be accessed only from any subclass in a specific package. package com.example { class FooClass { protected[example] val x = "foo" } class ClassB extends FooClass { val y = x // It's in the protected scope, will compile ...

The following Less: .paragraph{ font-size: 12px; color: blue; background: white; } .parent{ font-size: 14px; color: black; background: green; .nestedParagraph:extend(.paragraph){ } } will compile into the following css: .paragraph, .parent .nestedParagraph { ...

The following Less .paragraph{ font-size: 12px; color: darkgrey; background: white; } .special-paragraph{ font-size: 24px; font-weight: bold; color: black; } .parent{ background: lightgrey; .nestedParagraph{ &:extend(.paragraph); &:extend(.special-p...

You may also extend nested selectors. The below Less .otherChild{ color: blue; } .otherParent{ color: red; .otherChild{ font-size: 12px; color: green; } } .parent{ .nestedParagraph{ &:extend(.otherParent .otherChild); } } Will compile to .otherChild...

The following Less div.paragraph{ color: blue; } *.paragraph{ color: green; } .otherClass.paragraph{ color: red; } .paragraph.otherClass{ color: darkgrey; } .parent{ .nestedParagraph{ &:extend(.paragraph); } } Will compile into div.paragraph { colo...

You can establish a transaction by calling the pipeline method on the StrictRedis. Redis commands executed against the transaction are performed in a single block. # defaults to transaction=True tx = r.pipeline() tx.hincrbyfloat(debit_account_key, 'balance', -amount) tx.hincrbyfloat(credit_acc...

The following Less .addDivider::before{ content: ""; height: 80%; background: white; width: 1px; position: absolute; top: 10%; left: 0; } .nav-bar{ background: black; display: flex; flex-direction: row; width: 400px; .nav-item{ color: white...

By default, NuGet restores packages into the packages folder in the solution root. This folder is shared between all solution projects. In some cases it is useful to change the location of the restored packages (for instance, to share them between several solutions). Its can be achieved by creating...

Add gem 'figaro' to your Gemfile and run bundle install. Then run bundle exec figaro install; this will create config/application.yml and add it to your .gitignore file, preventing it from being added to version control. You can store your keys in application.yml in this format: SECRET_NAME: secre...

For all my projects, Django-Allauth remained one that is easy to setup, and comes out of the box with many features including but not limited to: Some 50+ social networks authentications Mix signup of both local and social accounts Multiple social accounts Optional instant-signup for social ac...

The Jedis library is generally added to Java project using a dependency management system built into the build environment of the project. Two popular Java build systems are Maven and Gradle. Using Gradle To add the Jedis library to a Gradle project, you will need configure a repository and add a...

Using a Pool Most code will want to connect to Redis using a pool of shared connection objects. Connecting to Redis using a pool involves two different code block. At initialization time, your application needs to create the connection pool: JedisPoolConfig poolCfg = new JedisPoolConfig(); ...

Once you have established a connection to Redis you can get and set values using the Jedis connection object: Get String value = jedis.get(myKey); Set jedis.put(myKey, "some value");

CentOS versions 2 - 5 CentOS version 7 CentOS 7 is fully based on RedHat the detail documentation, examples and system administration guides are located here:CentOS 7 full documention

Add the slf4j dependency to your pom.xml: <properties> <slf4j.version>1.7.21</slf4j.version> </properties> <!-- ... --> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version&gt...