Tutorial by Examples: c

var dict = ["name": "John", "surname": "Doe"] // Set the element with key: 'name' to 'Jane' dict["name"] = "Jane" print(dict)

using System.Net; using System.IO; ... string requestUrl = "https://www.example.com/submit.html"; HttpWebRequest request = HttpWebRequest.CreateHttp(requestUrl); request.Method = "POST"; // Optionally, set properties of the HttpWebRequest, such as: request.AutomaticD...

using System.Net; using System.IO; ... string requestUrl = "https://www.example.com/page.html"; HttpWebRequest request = HttpWebRequest.CreateHttp(requestUrl); // Optionally, set properties of the HttpWebRequest, such as: request.AutomaticDecompression = DecompressionMethods.GZ...

using System.Net; ... string serverResponse; try { // Call a method that performs an HTTP request (per the above examples). serverResponse = PerformHttpRequest(); } catch (WebException ex) { if (ex.Status == WebExceptionStatus.ProtocolError) { HttpWebResponse...

A list can be rendered using the v-for directive. The syntax requires that you specify the source array to iterate on, and an alias that will be used to reference each item in the iteration. In the following example we use items as the source array, and item as the alias for each item. HTML <di...

let myAllKeys = ["name" : "Kirit" , "surname" : "Modi"] let allKeys = Array(myAllKeys.keys) print(allKeys)

Common table expressions support extracting portions of larger queries. For example: WITH sales AS ( SELECT orders.ordered_at, orders.user_id, SUM(orders.amount) AS total FROM orders GROUP BY orders.ordered_at, orders.user_id ) SELECT sales.ordered_at, sales.total,...

When creating Random instances with the same seed, the same numbers will be generated. int seed = 5; for (int i = 0; i < 2; i++) { Console.WriteLine("Random instance " + i); Random rnd = new Random(seed); for (int j = 0; j < 5; j++) { Console.Write(rnd.Next(...

Two Random class created at the same time will have the same seed value. Using System.Guid.NewGuid().GetHashCode() can get a different seed even in the same time. Random rnd1 = new Random(); Random rnd2 = new Random(); Console.WriteLine("First 5 random number in rnd1"); for (int i = 0...

The main methods that are useful with this class are popleft and appendleft from collections import deque d = deque([1, 2, 3]) p = d.popleft() # p = 1, d = deque([2, 3]) d.appendleft(5) # d = deque([5, 2, 3])

Average The AVG() aggregate function will return the average of values selected. SELECT AVG(Salary) FROM Employees Aggregate functions can also be combined with the where clause. SELECT AVG(Salary) FROM Employees where DepartmentId = 1 Aggregate functions can also be combined with group by ...

Jasmine can spy on an existing function using the spyOn function. let calculator = { multiply: function(a, b) { return a * b; }, square: function(a) { return this.multiply(a, a); } } describe('calculator', function() { it('squares numbers by multiplying them by the...

We can use jasmine.createSpy() to create a standalone spy. This is often useful if we need to pass a function as a callback to another function and want to test how it is used. // source code function each(arr, fn) { arr.forEach(fn); } // test code describe('each', function() { let m...

The NSDate class provides methods for creating NSDate objects corresponding to a given date and time. An NSDate can be initialized using the designated initializer, which: Returns an NSDate object initialized relative to 00:00:00 UTC on 1 January 2001 by a given number of seconds. NSDate *date...

We can match on lists like any other data type, though they are somewhat unique, in that the constructor for building up lists is the infix function ::. (See the example Creating a list for more on how that works.) matchMyList : List SomeType -> SomeOtherType matchMyList myList = case myL...

If you're ever dealing with C Binary API's from Perl Code, via the syscall, ioctl, or fcntl functions, you need to know how to construct memory in a C Compatible way. For instance, if you were ever dealing with some function that expected a timespec, you'd look into /usr/include/time.h and find: s...

The procedure describes how to add an Object library reference, and afterwards how to declare new variables with reference to the new library class objects. The example below shows how to add the PowerPoint library to the existing VB Project. As can be seen, currently the PowerPoint Object library...

In addition to the standard makeLenses function for generating Lenses, Control.Lens.TH also offers the makeClassy function. makeClassy has the same type and works in essentially the same way as makeLenses, with one key difference. In addition to generating the standard lenses and traversals, if the ...

Large Multi-Line strings are burdensome to write. my $variable = <<'EOF'; this block of text is interpreted literally, no \'quotes matter, they're just text only the trailing left-aligned EOF matters. EOF NB: Make sure you ignore stack-overflows syntax highlighter: It is very wrong. A...

In Haskell, data types can have arguments just like functions. Take the Maybe type for example. Maybe is a very useful type which allows us to represent the idea of failure, or the possiblity thereof. In other words, if there is a possibility that a computation will fail, we use the Maybe type ther...