Tutorial by Examples: n

Any text following a " character on the same line is commented out: DATA ls_booking TYPE flightb. " Commented text

The * character comments out an entire line. The * must be the first character in the line. * DATA ls_booking TYPE flightb. Nothing on this line will be executed.

Detailed instructions on getting domain-driven-design set up or installed.

In certain situations, data declarations can be performed inline. LOOP AT lt_sflight INTO DATA(ls_sflight). WRITE ls_sflight-carrid. ENDLOOP.

DATA begda TYPE sy-datum.

DATA: begda TYPE sy-datum, endda TYPE sy-datum.

A Map is a basic mapping of keys to values. Maps are different from objects in that their keys can be anything (primitive values as well as objects), not just strings and symbols. Iteration over Maps is also always done in the order the items were inserted into the Map, whereas the order is undefine...

The ToDictionary() LINQ method can be used to generate a Dictionary<TKey, TElement> collection based on a given IEnumerable<T> source. IEnumerable<User> users = GetUsers(); Dictionary<int, User> usersById = users.ToDictionary(x => x.Id); In this example, the single ar...

Grand Central Dispatch works on the concept of "Dispatch Queues". A dispatch queue executes tasks you designate in the order which they are passed. There are three types of dispatch queues: Serial Dispatch Queues (aka private dispatch queues) execute one task at a time, in order. They a...

3.0 To run tasks on a dispatch queue, use the sync, async, and after methods. To dispatch a task to a queue asynchronously: let queue = DispatchQueue(label: "myQueueName") queue.async { //do something DispatchQueue.main.async { //this will be called in main t...

int is an alias for System.Int32, which is a data type for signed 32-bit integers. This data type can be found in mscorlib.dll which is implicitly referenced by every C# project when you create them. Range: -2,147,483,648 to 2,147,483,647 int int1 = -10007; var int2 = 2132012521;

The long keyword is used to represent signed 64-bit integers. It is an alias for the System.Int64 datatype present in mscorlib.dll, which is implicitly referenced by every C# project when you create them. Any long variable can be declared both explicitly and implicitly: long long1 = 92233720368547...

Keyword used for unsigned 64-bit integers. It represents System.UInt64 data type found in mscorlib.dll which is implicitly referenced by every C# project when you create them. Range: 0 to 18,446,744,073,709,551,615 ulong veryLargeInt = 18446744073609451315; var anotherVeryLargeInt = 1544674406360...

Display multiple plots in one image with the different facet functions. An advantage of this method is that all axes share the same scale across charts, making it easy to compare them at a glance. We'll use the mpg dataset included in ggplot2. Wrap charts line by line (attempts to create a square l...

ggplot2 works best with a long data frame. The following sample data which represents the prices for sweets on 20 different days, in a format described as wide, because each category has a column. set.seed(47) sweetsWide <- data.frame(date = 1:20, chocolate = run...

Arrays are objects, but their type is defined by the type of the contained objects. Therefore, one cannot just cast A[] to T[], but each A member of the specific A[] must be cast to a T object. Generic example: public static <T, A> T[] castArray(T[] target, A[] array) { for (int i = 0; i...

Letters 3.0 let letters = CharacterSet.letters let phrase = "Test case" let range = phrase.rangeOfCharacter(from: letters) // range will be nil if no letters is found if let test = range { print("letters found") } else { print("letters not found") }...

A common question is how to juxtapose (combine) physically separate geographical regions on the same map, such as in the case of a choropleth describing all 50 American states (The mainland with Alaska and Hawaii juxtaposed). Creating an attractive 50 state map is simple when leveraging Google Maps...

Java doesn't provide a direct method in java.util.Arrays to remove an element from an array. To perform it, you can either copy the original array to a new one without the element to remove or convert your array to another structure allowing the removal. Using ArrayList You can convert the array t...

The + symbol marks a type parameter as covariant - here we say that "Producer is covariant on A": trait Producer[+A] { def produce: A } A covariant type parameter can be thought of as an "output" type. Marking A as covariant asserts that Producer[X] <: Producer[Y] prov...