The addition and multiplication have equivalents in this type algebra. They correspond to the tagged unions and product types.
data Sum a b = A a | B b
data Prod a b = Prod a b
We can see how the number of inhabitants of every type corresponds to the operations of the algebra.
Equivalently, we...
Lists
Lists can be defined as:
data List a = Nil | Cons a (List a)
If we translate this into our type algebra, we get
List(a) = 1 + a * List(a)
But we can now substitute List(a) again in this expression multiple times, in order to get:
List(a) = 1 + a + a*a + a*a*a + a*a*a*a + ...
...
Usage
Sometimes, you could have to debug code in another PhpStorm project, you have to update the configuration.
PHP configuration
In php.ini, edit file and put xdebug.remote_autostart = 1
PhpStorm configuration
You also have to configure your IDE:
In the phpStorm configuration, Max. sim...
The most important consequence of the One Definition Rule is that non-inline functions with external linkage should only be defined once in a program, although they can be declared multiple times. Therefore, such functions should not be defined in headers, since a header can be included multiple tim...
A function template can be overloaded under the rules for non-template function overloading (same name, but different parameter types) and in addition to that, the overloading is valid if
The return type is different, or
The template parameter list is different, except for the naming of paramete...
This code sends a simple text-only email to [email protected]
EXEC msdb.dbo.sp_send_dbmail
@profile_name = 'The Profile Name',
@recipients = '[email protected]',
@body = 'This is a simple email sent from SQL Server.',
@subject = 'Simple email'
auto is used in the syntax for trailing return type:
auto main() -> int {}
which is equivalent to
int main() {}
Mostly useful combined with decltype to use parameters instead of std::declval<T>:
template <typename T1, typename T2>
auto Add(const T1& lhs, const T2& rh...
As far as client-side JavaScript engines are concerned (those running inside a browser), there is no straightforward solution available for requesting content from sources other than the current domain. (By the way, this limitation does not exist in JavaScript-server tools such as Node JS.)
However...
Create Dynamic Web project, provide following information's as stated below
Project name : DemoSpringMVCProject
Target runtime : set as Apache Tomcat v7.0 server
Click on finish, successfully we have created dynamic web project.
Now we have to setup Spring-MVC framework :
Create web.xml...
SoundEffect.Play() plays the sound effect in a "fire-and-forget" fashion. The sound plays once and its lifetime is managed by the framework. You are not able to change the properties (volume, pan, pitch) of the sound during playback, loop it, position it in 3D or pause it.
You can hold a ...
Google Sheets is a spreadsheet application that runs on web browser. It doesn't require any installation or setup just a Google account and a modern web browser.
The first time a user runs a project's gradlew, it should be realized that it will do two key things:
Check to see if the version of the gradle used by the wrapper is already in ~/.gradle/wrapper/dists
If not, download the archive of the version from the internet
If you're in an environment t...
This is a relatively common mistake: You created an rect element, in a bar chart for instance, and you want to add a text label (let's say, the value of that bar). So, using the same variable that you used to append the rect and define its x and y position, you append your text element. Very logic, ...
6
This can be done using the .repeat() method:
"abc".repeat(3); // Returns "abcabcabc"
"abc".repeat(0); // Returns ""
"abc".repeat(-1); // Throws a RangeError
6
In the general case, this should be done using a correct polyfill for the ES6...
Arrow is, vaguely speaking, the class of morphisms that compose like functions, with both serial composition and “parallel composition”. While it is most interesting as a generalisation of functions, the Arrow (->) instance itself is already quite useful. For instance, the following function:
sp...
A typed hole is a single underscore (_) or a valid Haskell identifier which is not in scope, in an expression context. Before the existance of typed holes, both of these things would trigger an error, so the new syntax does not interfere with any old syntax.
Controlling behaviour of typed holes
Th...
The value of a type hole can simply said to be undefined, although a typed hole triggers a compile-time error, so it is not strictly necessary to assign it a value. However, a typed hole (when they are enabled) produces a compile time error (or warning with deferred type errors) which states the nam...
CoffeeScript's existential operator ? check if the variable is null or undefined.
1. Check for null or undefined.
alert "Hello CoffeeScript!" if myVar?
javascript equivalent:
if (typeof myVar !== "undefined" && myVar !== null) {
alert("Hello CoffeeScript!&qu...
