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There are a number of collection types in Python. While types such as int and str hold a single value, collection types hold multiple values. Lists The list type is probably the most commonly used collection type in Python. Despite its name, a list is more like an array in other languages, mostl...

For instance, a computation involving commands to read and write from the prompt: First we describe the "commands" of our computation as a Functor data type {-# LANGUAGE DeriveFunctor #-} data TeletypeF next = PrintLine String next | ReadLine (String -> next) derivin...

Create an application heroku create your-app-name Deploy to Heroku git push heroku master Open your application in a browser heroku open your-app-name List Heroku commands heroku commands General help heroku help Help for a specific command heroku help <command>

Constructor functions are functions designed to construct a new object. Within a constructor function, the keyword this refers to a newly created object which values can be assigned to. Constructor functions "return" this new object automatically. function Cat(name) { this.name = name;...

Each time you use a selector in jQuery the DOM is searched for elements that match your query. Doing this too often or repeatedly will decrease performance. If you refer to a specific selector more than once you should add it to the cache by assigning it to a variable: var nav = $('#navigation'); ...

Using the apt package manager sudo apt-get update sudo apt-get install nodejs sudo apt-get install npm sudo ln -s /usr/bin/nodejs /usr/bin/node # the node & npm versions in apt are outdated. This is how you can update them: sudo npm install -g npm sudo npm install -g n sudo n stabl...

There are two parts of a class: the interface and the implementation. The interface is the exposed functionality of the class. Its public methods and variables are part of the interface. The implementation is the internal workings of a class. Other classes shouldn't need to know about the implemen...

Encapsulation allows you to make internal changes to a class without affecting any code that calls the class. This reduces coupling, or how much any given class relies on the implementation of another class. For example, let's change the implementation of the Angle class from the previous example: ...

When implementing more than one interface that have methods of the same name that include default implementations, it is ambiguous to the compiler which implementation should be used. In the case of a conflict, the developer must override the conflicting method and provide a custom implementation. ...

x = np.arange(4) x #Out:array([0, 1, 2, 3]) scalar addition is element wise x+10 #Out: array([10, 11, 12, 13]) scalar multiplication is element wise x*2 #Out: array([0, 2, 4, 6]) array addition is element wise x+x #Out: array([0, 2, 4, 6]) array multiplication is element wise x...

The basics After making changes to your source code, you should stage those changes with Git before you can commit them. For example, if you change README.md and program.py: git add README.md program.py This tells git that you want to add the files to the next commit you do. Then, commit your...

Compares two values for equality. It can compare strings, integers, and Boolean values only. Assert.AreEqual(documentElement.LocalName, "xamlControls", "Xaml files must have a root node named 'xamlControls'.");

$(element).hide() // sets display: none $(element).show() // sets display to original value $(element).toggle() // toggles between the two $(element).is(':visible') // returns true or false $('element:visible') // matches all elements that are visible $...

If an object is defined with static, thread, or automatic storage duration, and it has a character type, either: char, unsigned char, or signed char, it may not be accessed by a non-character type. In the below example a char array is reinterpreted as the type int, and the behavior is undefined on e...

First download anaconda from the Continuum site. Either via the graphical installer (Windows/OSX) or running a shell script (OSX/Linux). This includes pandas! If you don't want the 150 packages conveniently bundled in anaconda, you can install miniconda. Either via the graphical installer (Window...

Installing Jasmine standalone Download the latest Jasmine release from the Jasmine release page: Running Jasmine locally Run Jasmine in the browser by downloading the zip file, extracting it, the referencing the files as follows: <link rel="shortcut icon" type="image/png&qu...

jQuery offers a variety of methods that can be used for DOM manipulation. The first is the .empty() method. Imagine the following markup: <div id="content"> <div>Some text</div> </div> By calling $('#content').empty();, the inner div would be removed. This...

A query engine is required in order to execute SPARQL queries over a dataset. Query engines may be embedded in applications, or accessed remotely. Remote access may be through a vendor-specific API, or through the SPARQL protocol if an implementation supports it. This documentation will not cover ho...

Forms can be defined, in a similar manner to models, by subclassing django.forms.Form. Various field input options are available such as CharField, URLField, IntegerField, etc. Defining a simple contact form can be seen below: from django import forms class ContactForm(forms.Form): contac...

Detailed instructions on getting Zend Framework 2 set up or installed. There are various ways of installing the framework. Below are some of them: Using Composer - Recommended way Assuming composer is installed on the target box. To install a skeleton MVC application, run in your terminal to crea...