Tutorial by Examples: ar

If a selection on multiple arguments for a type generic expression is wanted, and all types in question are arithmetic types, an easy way to avoid nested _Generic expressions is to use addition of the parameters in the controlling expression: int max_int(int, int); unsigned max_unsigned(unsigned, ...

Note: Before deciding which Stream to use please have a look at ParallelStream vs Sequential Stream behavior. When you want to perform Stream operations concurrently, you could use either of these ways. List<String> data = Arrays.asList("One", "Two", "Three", &q...

This example requires the headers <algorithm>, <locale>, and <utility>. C++11 To trim a sequence or string means to remove all leading and trailing elements (or characters) matching a certain predicate. We first trim the trailing elements, because it doesn't involve moving any el...

Sometimes you have to check for a condition and set the value of a variable. For ex. String name; if (A > B) { name = "Billy"; } else { name = "Jimmy"; } This can be easily written in one line as String name = A > B ? "Billy" : "Jimmy&quo...

A custom component that takes the type of a component as input and creates an instance of that component type inside itself. When the input is updated, the previously added dynamic component is removed and the new one added instead. @Component({ selector: 'dcl-wrapper', template: `<div #...

This example is a quick setup of Angular 2 and how to generate a quick example project. Prerequisites: Node.js v4 or greater. npm v3 or greater or yarn. Open a terminal and run the commands one by one: npm install -g @angular/cli or yarn global add @angular/cli depending on your choi...

You can iterate over arrays either by using enhanced for loop (aka foreach) or by using array indices: int[] array = new int[10]; // using indices: read and write for (int i = 0; i < array.length; i++) { array[i] = i; } Java SE 5 // extended for: read only for (int e : array) { ...

Lets assume you have a class called Person with just name private class Person { public String name; public Person(String name) { this.name = name; } } Code: Gson g = new Gson(); Person person = new Person("John"); System.out.println(g.toJson(person)); /...

Lets assume you have a class called Person with just name private class Person { public String name; public Person(String name) { this.name = name; } } Code: Gson gson = new Gson(); String json = "{\"name\": \"John\"}"; Person person ...

With any variadic function, the function must know how to interpret the variable arguments list. With the printf() or scanf() functions, the format string tells the function what to expect. The simplest technique is to pass an explicit count of the other arguments (which are normally all the same ...

As long as the element is a block, and it has an explicitly set width value, margins can be used to center block elements on a page horizontally. We add a width value that is lower than the width of the window and the auto property of margin then distributes the remaining space to the left and the ...

Prefer public class Order { public OrderLine AddOrderLine(OrderLine orderLine) { if (orderLine == null) throw new ArgumentNullException(nameof(orderLine)); ... } } Over public class Order { public OrderLine AddOrderLine(OrderLine orderLine) { ...

Partial templates (partials) are a way of breaking the rendering process into more manageable chunks. Partials allow you to extract pieces of code from your templates to separate files and also reuse them throughout your templates. To create a partial, create a new file that begins with an undersco...

preg_match checks whether a string matches the regular expression. $string = 'This is a string which contains numbers: 12345'; $isMatched = preg_match('%^[a-zA-Z]+: [0-9]+$%', $string); var_dump($isMatched); // bool(true) If you pass in a third parameter, it will be populated with the matchi...

Special care needs to be taken when there is a possibility that an array become an empty array when it comes to logical operators. It is often expected that if all(A) is true then any(A) must be true and if any(A) is false, all(A) must also be false. That is not the case in MATLAB with empty arrays....

Strings are compared for equality using isEqualToString: The == operator just tests for object identity and does not compare the logical values of objects, so it can't be used: NSString *stringOne = @"example"; NSString *stringTwo = [stringOne mutableCopy]; BOOL objectsAreIdentical =...

Modules can have a special variable named __all__ to restrict what variables are imported when using from mymodule import *. Given the following module: # mymodule.py __all__ = ['imported_by_star'] imported_by_star = 42 not_imported_by_star = 21 Only imported_by_star is imported when usi...

There are two ways to connect to a MySQL/MariaDB server, depending on your infrastructure. Standard (TCP/IP) connection $dsn = 'mysql:dbname=demo;host=server;port=3306;charset=utf8'; $connection = new \PDO($dsn, $username, $password); // throw exceptions, when SQL error is caused $connection-...

First, some terminology: argument (actual parameter): the actual variable being passed to a function; parameter (formal parameter): the receiving variable that is used in a function. In Python, arguments are passed by assignment (as opposed to other languages, where arguments can be passed by...

Normally you would want to avoid using cursors as they can have negative impacts on performance. However in some special cases you may need to loop through your data record by record and perform some action. DECLARE @orderId AS INT -- here we are creating our cursor, as a local cursor and only a...