Tutorial by Examples: at

Inheritance and Static Methods

In Java, parent and child class both can have static methods with the same name. But in such cases implementation of static method in child is hiding parent class' implementation, it's not method overriding. For example: class StaticMethodTest { // static method and inheritance public stati...

Java Language • Inheritance

Introduction to Dispatch

We can use the :: syntax to dispatch on the type of an argument. describe(n::Integer) = "integer $n" describe(n::AbstractFloat) = "floating point $n" Usage: julia> describe(10) "integer 10" julia> describe(1.0) "floating point 1.0" Unlike m...

Julia Language • Functions

Imperative factorial

A long-form syntax is available for defining multi-line functions. This can be useful when we use imperative structures such as loops. The expression in tail position is returned. For instance, the below function uses a for loop to compute the factorial of some integer n: function myfactorial(n) ...

Julia Language • Functions

Passing Data from parent to child with props

In Vue.js, every component instance has its own isolated scope, which means that if a parent component has a child component - the child component has its own isolated scope and the parent component has its own isolated scope. For any medium to large size app, following best practices conventions p...

Vue.js • Props

Component setup for Application and Activity injection

A basic AppComponent that depends on a single AppModule to provide application-wide singleton objects. @Singleton @Component(modules = AppModule.class) public interface AppComponent { void inject(App app); Context provideContext(); Gson provideGson(); } A module to use to...

Android • Dagger 2

CoordinatorLayout

2.3 The CoordinatorLayout is a container somewhat similar to FrameLayout but with extra capabilities, it is called super-powered FrameLayout in the official documentation. By attaching a CoordinatorLayout.Behavior to a direct child of CoordinatorLayout, you’ll be able to intercept touch events, wi...

Android • Layouts

Convert java.util.Date to java.sql.Date

java.util.Date to java.sql.Date conversion is usually necessary when a Date object needs to be written in a database. java.sql.Date is a wrapper around millisecond value and is used by JDBC to identify an SQL DATE type In the below example, we use the java.util.Date() constructor, that creates a D...

Java Language • Date Class

Constructor patterns

Cons-cells, structures, vectors, lists and such can be matched with constructor patterns. (loop for i from 1 to 30 do (format t "~5<~a~;~>" (match (cons (mod i 3) (mod i 5)) ((cons 0 0) "Fizzbuzz")...

common-lisp • Pattern matching

Guard-pattern

Guard patterns can be used to check that a value satisfies an arbitrary test-form. (dotimes (i 5) (format t "~d: ~a~%" i (match i ((guard x (oddp x)) "Odd!") (_ "Even!")))) ; 0: Even! ; 1: Odd! ; 2: Even! ; 3: Odd! ; 4: ...

common-lisp • Pattern matching

Padding and truncating strings, combined

Say you want to print variables in a 3 character column. Note: doubling { and } escapes them. s = """ pad {{:3}} :{a:3}: truncate {{:.3}} :{e:.3}: combined {{:>3.3}} :{a:>3.3}: {{:3.3}} :{a:3.3}: {{:3.3}} :{c:3...

Python Language • String Formatting

Simulate call

To simulate a phone call, press the 'Extended controls' button indicated by three dots, choose 'Phone' and select 'Call'. You can also optionally change the phone number.

Android • Emulator

Translating a LINQ query to a SQL query

The IQueryable and IQueryable<T> interfaces allows developers to translate a LINQ query (a 'language-integrated' query) to a specific datasource, for example a relational database. Take this LINQ query written in C#: var query = from book in books where book.Author == "Steph...

C# Language • IQueryable interface

Tutorial by Examples: at

Inheritance and Static Methods

Introduction to Dispatch

Imperative factorial

Passing Data from parent to child with props

Component setup for Application and Activity injection

CoordinatorLayout

Convert java.util.Date to java.sql.Date

Constructor patterns

Guard-pattern

Padding and truncating strings, combined

Simulate call

Translating a LINQ query to a SQL query

Search for nodes that has name that contains Light

Search for nodes that has name that starts with Star

Search for nodes that has name that ends with Ball

Find nodes with a specific attribute

Find nodes with a specific attribute value

Find nodes by substring matching of an attribute's value

Find nodes by substring matching of an attribute's value (case-insensitive)

Find nodes by substring matching the start of an attribute's value