Tutorial by Examples: ar

var A var is a reference variable, similar to variables in languages like Java. Different objects can be freely assigned to a var, so long as the given object has the same type that the var was declared with: scala> var x = 1 x: Int = 1 scala> x = 2 x: Int = 2 scala> x = "foo...

Method 1 Gson gson = new Gson(); String json = "[ \"Adam\", \"John\", \"Mary\" ]"; Type type = new TypeToken<List<String>>(){}.getType(); List<String> members = gson.fromJson(json, type); Log.v("Members", members.toString());...

int[string] wordCount(string[] wordList) { int[string] words; foreach (word; wordList) { words[word]++; } return words; } void main() { int[string] count = wordCount(["hello", "world", "I", "say", "hello"]); ...

3.0 The most simple way is to use sorted(): let words = ["Hello", "Bonjour", "Salute", "Ahola"] let sortedWords = words.sorted() print(sortedWords) // ["Ahola", "Bonjour", "Hello", "Salute"] or sort() var mutable...

The method compareTo should be used to compare BigDecimals: BigDecimal a = new BigDecimal(5); a.compareTo(new BigDecimal(0)); // a is greater, returns 1 a.compareTo(new BigDecimal(5)); // a is equal, returns 0 a.compareTo(new BigDecimal(10)); // a is less, returns -1 Commonly you shou...

PostgreSQL and SQLite To create a temporary table local to the session: CREATE TEMP TABLE MyTable(...); SQL Server To create a temporary table local to the session: CREATE TABLE #TempPhysical(...); To create a temporary table visible to everyone: CREATE TABLE ##TempPhysicalVisibleToEveryo...

Sometimes we would like to pass into the template a template type without fixing its values. This is what template template parameters are created for. Very simple template template parameter examples: template <class T> struct Tag1 { }; template <class T> struct Tag2 { }; templ...

Guard clauses enables us to check the arguments before executing the function. Guard clauses are usually preferred to if and cond due to their readability, and to make a certain optimization technique easier for the compiler. The first function definition where all guards match is executed. Here is...

You can pass default parameters to any named function using the syntax: param \\ value: defmodule Example do def func(p1, p2 \\ 2) do IO.inspect [p1, p2] end end Example.func("a") # => ["a", 2] Example.func("b", 4) # => ["b", ...

C99 Type Declaration A structure with at least one member may additionally contain a single array member of unspecified length at the end of the structure. This is called a flexible array member: struct ex1 { size_t foo; int flex[]; }; struct ex2_header { int foo; char...

Binding is the process of assigning an object to an identifier or variable name. Early binding (also known as static binding) is when an object declared in Excel is of a specific object type, such as a Worksheet or Workbook. Late binding occurs when general object associations are made, such as the ...

NOW() + INTERVAL 1 DAY -- This time tomorrow CURDATE() - INTERVAL 4 DAY -- Midnight 4 mornings ago Show the mysql questions stored that were asked 3 to 10 hours ago (180 to 600 minutes ago): SELECT qId,askDate,minuteDiff FROM ( SELECT qId,askDate, TIMESTAMPDIFF(MINUTE,askDate,no...

As we know that we should use synchronized keyword to make execution of a method or block exclusive. But few of us may not be aware of one more important aspect of using synchronized and volatile keyword: apart from making a unit of code atomic, it also provides read / write barrier. What is this re...

private static void explicitTaskParallism() { Thread.CurrentThread.Name = "Main"; // Create a task and supply a user delegate by using a lambda expression. Task taskA = new Task(() => Console.WriteLine($"Hello from task {nameof(taskA)}.")...

private static void Main(string[] args) { var a = new A(); var b = new B(); //implicit task parallelism Parallel.Invoke( () => a.DoSomeWork(), () => b.DoSomeOtherWork() ); }

In C, all function parameters are passed by value, so modifying what is passed in callee functions won't affect caller functions' local variables. #include <stdio.h> void modify(int v) { printf("modify 1: %d\n", v); /* 0 is printed */ v = 42; printf("modify 2:...

Ruby has a ternary operator (?:), which returns one of two value based on if a condition evaluates as truthy: conditional ? value_if_truthy : value_if_falsy value = true value ? "true" : "false" #=> "true" value = false value ? "true" : "fals...

This example shows how to open a default dialer (an app that makes regular calls) with a provided telephone number already in place: Intent intent = new Intent(Intent.ACTION_DIAL); intent.setData(Uri.parse("tel:9988776655")); //Replace with valid phone number. Remember to add the tel: pr...

Rules for creating a dictionary: Every key must be unique (otherwise it will be overridden) Every key must be hashable (can use the hash function to hash it; otherwise TypeError will be thrown) There is no particular order for the keys. # Creating and populating it with values stock = {'egg...

def foobar(foo=None, bar=None): return "{}{}".format(foo, bar) values = {"foo": "foo", "bar": "bar"} foobar(**values) # "foobar"