Tutorial by Examples: l

Draper automatically matches up models with their decorators by convention. # app/decorators/user_decorator.rb class UserDecorator < Draper::Decorator def full_name "#{object.first_name} #{object.last_name}" end def created_at Time.use_zone(h.current_user.timezone...

Postscript is a dynamic-namespacing or LISP 1 language. But it provides the tools to implement local variables in procedures and other effects needed to implement algorithms. For local names in a procedure, make a new dictionary at the start and pop it at the end. /myproc { 10 dict begin ...

Select a font and fontsize, select location, show string. %!PS /Palatino-Roman 20 selectfont 300 400 moveto (Hello, World!) show showpage Notes and common pitfalls: Failing to set a font (resulting in either no text or a default (ugly) font) Using findfont and setfont but forgettin...

Detailed instructions on getting rails-activerecord set up or installed.

After finding an official Julia package, it is straightforward to download and install the package. Firstly, it's recommended to refresh the local copy of METADATA: julia> Pkg.update() This will ensure that you get the latest versions of all packages. Suppose that the package we want to inst...

Some experimental packages are not included in the METADATA package repository. These packages can be installed by directly cloning their Git repositories. Note that there may be dependencies of unregistered packages that are themselves unregistered; those dependencies cannot be resolved by the pack...

According to Material Documentation: A linear progress indicator should always fill from 0% to 100% and never decrease in value. It should be represented by bars on the edge of a header or sheet that appear and disappear. To use a material Linear ProgressBar just use in your xml: <Progres...

This example covers common errors with using the 'java' command. "Command not found" If you get an error message like: java: command not found when trying to run the java command, this means that there is no java command on your shell's command search path. The cause could be: yo...

WampServer is a Windows web development environment. It allows you to create web applications with Apache2, PHP and a MySQL database. Alongside, PhpMyAdmin allows you to manage easily your databases. WampServer is available for free (under GPML license) in two distinct versions : 32 and 64 bits. Wa...

Julia Symbol literals must be legal identifiers. This works: julia> :cat :cat But this does not: julia> :2cat ERROR: MethodError: no method matching *(::Int64, ::Base.#cat) Closest candidates are: *(::Any, ::Any, ::Any, ::Any...) at operators.jl:288 *{T<:Union{Int128,Int16,Int...

This is a continuation of the "main class" and "executable JAR" examples. Typical Java applications consist of an application-specific code, and various reusable library code that you have implemented or that has been implemented by third parties. The latter are commonly referr...

Search for a lemma when you know what its conclusion ought to be: Coq < SearchPattern (S _ <= _). le_n_S: forall n m : nat, n <= m -> S n <= S m You can also search on a partial conclusion (the conclusion and one or several last hypotheses). Coq < Require Import Arith. Coq &...

Consider this CSV data: #id,title,text 1,hello world,"This is a ""blog""." 2,second time,"My second entry." This data can be read with the following code: // r can be any io.Reader, including a file. csvReader := csv.NewReader(r) // Set comment char...

If you use the TeX Live distribution you can use the command-line program texdoc. For instance, texdoc biblatex will open the documentation of package biblatex. Or if you are not command-line-savvy, the same can be found online at http://www.texdoc.net/

Depending on the service, you will either need to use Basic Authentication with a username and password or pass an apikey as a parameter in each request. Some services also support token authentication. GET using Tone Analyzer: curl -X GET \ -u "username":"password" \ -d &qu...

The quickest way to get started with Watson services is to use the Watson Developer Cloud SDKs. The following GitHub repositories contain installation instructions and basic usage examples: Android iOS Java Node.js Python Unity For example, here's how to make an AlchemyLanguage API call w...

Groups can be configured under Suite and/or Test element of testng.xml. All groups which are marked as included in tesng.xml will be considered for execution, excluded one will be ignored. If a @Test method has multiple groups and from those groups if any single groups is excluded in testng.xml that...

HTML: <div class="container"> <span>vertically centered</span> </div> CSS: .container{ height: 50px; /* set height */ line-height: 50px; /* set line-height equal to the height */ vertical-align: middle; /* works without this ...

trait Speak { fn speak(&self) -> String { String::from("Hi.") } } The method will be called by default except if it's overwritten in the impl block. struct Human; struct Cat; impl Speak for Human {} impl Speak for Cat { fn speak(&self) -> S...

Detailed instructions on getting twitter-oauth set up or installed.