Tutorial by Examples: in

Regular instances require: All instance types must be of the form (T a1 ... an) where a1 ... an are *distinct type variables*, and each type variable appears at most once in the instance head. That means that, for example, while you can create an instance for [a] you can't create an instance f...
Normally, string literals in Haskell have a type of String (which is a type alias for [Char]). While this isn't a problem for smaller, educational programs, real-world applications often require more efficient storage such as Text or ByteString. OverloadedStrings simply changes the type of literals...
Standard Haskell allows you to write integer literals in decimal (without any prefix), hexadecimal (preceded by 0x or 0X), and octal (preceded by 0o or 0O). The BinaryLiterals extension adds the option of binary (preceded by 0b or 0B). 0b1111 == 15 -- evaluates to: True
This type of workflow is fundamentally different than the other ones mentioned on this topic. Instead of having one centralized repo that all developers have access to, each developer has his/her own repo that is forked from the main repo. The advantage of this is that developers can post to their o...
On OS X and MacOS, Elixir can be installed via the common package managers: Homebrew $ brew update $ brew install elixir Macports $ sudo port install elixir
In C++, sequences of characters are represented by specializing the std::basic_string class with a native character type. The two major collections defined by the standard library are std::string and std::wstring: std::string is built with elements of type char std::wstring is built with e...
map is a function in functional programming which given a list and a function, returns a new list with the function applied to each item in that list. In Elixir, the map/2 function is in the Enum module. iex> Enum.map([1, 2, 3, 4], fn(x) -> x + 1 end) [2, 3, 4, 5] Using the alternative c...
As seen in "Lambda Functions", functions can take other functions as a parameter. The "function type" which you'll need to declare functions which take other functions is as follows: # Takes no parameters and returns anything () -> Any? # Takes a string and an integer a...
Functions can be declared inline using the inline prefix, and in this case they act like macros in C - rather than being called, they are replaced by the function's body code at compile time. This can lead to performance benefits in some circumstances, mainly where lambdas are used as function param...
The .sort() method sorts the elements of an array. The default method will sort the array according to string Unicode code points. To sort an array numerically the .sort() method needs to have a compareFunction passed to it. Note: The .sort() method is impure. .sort() will sort the array in-place...
If you want to use the latest code, you can install it from the repository. While you potentially get new features and fixes, only numbered releases are officially supported. pip install https://github.com/pallets/flask/tarball/master
If you want to develop and contribute to the Flask project, clone the repository and install the code in development mode. git clone ssh://github.com/pallets/flask cd flask python3 -m venv env source env/bin/activate pip install -e . There are some extra dependencies and tools to be aware ...
Ajax Get: Solution 1: $.get('url.html', function(data){ $('#update-box').html(data); }); Solution 2: $.ajax({ type: 'GET', url: 'url.php', }).done(function(data){ $('#update-box').html(data); }).fail(function(jqXHR, textStatus){ alert('Error occured: ' + te...
Not always the enum name is clear enough to be understood. To document an enum, use standard javadoc: /** * United States coins */ public enum Coins { /** * One-cent coin, commonly known as a penny, * is a unit of currency equaling one-hundredth * of a United Sta...
$string = "0| PHP 1| CSS 2| HTML 3| AJAX 4| JSON"; //[0-9]: Any single character in the range 0 to 9 // + : One or more of 0 to 9 $array = preg_split("/[0-9]+\|/", $string, -1, PREG_SPLIT_NO_EMPTY); //Or // [] : Character class // \d : Any digit // + : One or more ...
Dim array = New Integer() {1, 2, 3, 4} or Dim array As Int32() = {1, 2, 3, 4}
Routing defines a map between HTTP methods and URIs on one side, and actions on the other. Routes are normally written in the app/Http/routes.php file. In its simplest form, a route is defined by calling the corresponding HTTP method on the Route facade, passing as parameters a string that match...
// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color a...
// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color at the top of...
// View to hold the CAGradientLayer. let view: UIView = UIView(frame: CGRect(x: 0, y: 0, width: 320, height: 320)) // Initialize gradient layer. let gradientLayer: CAGradientLayer = CAGradientLayer() // Set frame of gradient layer. gradientLayer.frame = view.bounds // Color at the top of...

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