Tutorial by Examples: ti

Getting information about EC2 instances

You can obtain information about EC2 instances using: aws ec2 describe-instances You can obtain information about specific EC2 instances using: aws ec2 describe-instances --instance-ids ... where ... contains one or more instance identifiers. For example: aws ec2 describe-instances --instan...

amazon-ec2 • Using aws-cli for Amazon EC2

Text Indent

p { text-indent: 50px; } The text-indent property specifies how much horizontal space text should be moved before the beginning of the first line of the text content of an element. Resources: Indenting only the first line of text in a paragraph? https://www.w3.org/TR/CSS21/text.html#pr...

CSS • Typography

Text Decoration

The text-decoration property is used to set or remove decorations from text. h1 { text-decoration: none; } h2 { text-decoration: overline; } h3 { text-decoration: line-through; } h4 { text-decoration: underline; } text-decoration can be used in combination with text-decoration-style and text-...

CSS • Typography

Text Direction

div { direction: ltr; /* Default, text read read from left-to-right */ } .ex { direction: rtl; /* text read from right-to-left */ } .horizontal-tb { writing-mode: horizontal-tb; /* Default, text read from left-to-right and top-to-bottom. */ } .vertical-rtl { writing-mode: v...

CSS • Typography

Installation or Setup

Detailed instructions on getting jboss set up or installed.

jboss • Getting started with jboss

Primitive Types Cheatsheet

Table showing size and values range of all primitive types: data typenumeric representationrange of valuesdefault valuebooleann/afalse and truefalsebyte8-bit signed-27 to 27 - 10-128 to +127short16-bit signed-215 to 215 - 10-32,768 to +32,767int32-bit signed-231 to 231 - 10-2,147,483,648 to +2,147,...

Java Language • Primitive Data Types

Getting the Constants of an Enumeration

Giving this enumeration as Example: enum Compass { NORTH(0), EAST(90), SOUTH(180), WEST(270); private int degree; Compass(int deg){ degree = deg; } public int getDegree(){ return degree; } } In Java an enum class is like any other c...

Java Language • Reflection API

Adding a spinner to your activity

In /res/values/strings.xml: <string-array name="spinner_options"> <item>Option 1</item> <item>Option 2</item> <item>Option 3</item> </string-array> In layout XML: <Spinner android:id="@+id/spinnerName" ...

Android • Spinner

Installation

Direct Download - download link CDN - get here Bower - bower install bootstrap [read] NPM - npm install bootstrap [read] Composer - composer require twbs/bootstrap [read] Customize - I you have your own config, you can customize here. Sass - For Sass related projects you may get it here. ...

twitter-bootstrap-3 • Getting started with twitter-bootstrap-3

Referring to the declared generic type within its own declaration

How do you go about using an instance of a (possibly further) inherited generic type within a method declaration in the generic type itself being declared? This is one of the problems you will face when you dig a bit deeper into generics, but still a fairly common one. Assume we have a DataSeries&l...

Java Language • Generics

basic model fitting

apologies: since I don't know of a channel for discussing/providing feedback on requests for improvement, I'm going to put my question here. Please feel free to point out a better place for this! @DataTx states that this is "completely unclear, incomplete, or has severe formatting problems&quot...

R Language • Hierarchical Linear Modeling

Change primary key and timestamps

By default, Eloquent models expect for the primary key to be named 'id'. If that is not your case, you can change the name of your primary key by specifying the $primaryKey property. class Citizen extends Model { protected $primaryKey = 'socialSecurityNo'; // ... } Now, any Eloqu...

Laravel • Eloquent

Update an existing model

$user = User::find(1); $user->name = 'abc'; $user->save(); You can also update multiple attributes at once using update, which does not require using save afterwards: $user = User::find(1); $user->update(['name' => 'abc', 'location' => 'xyz']); You can also update a model(s)...

Laravel • Eloquent: Model

Throw 404 if entity not found

If you want to automatically throw an exception when searching for a record that isn't found on a modal, you can use either Vehicle::findOrFail(1); or Vehicle::where('make', 'ford')->firstOrFail(); If a record with the primary key of 1 is not found, a ModelNotFoundException is thrown. W...

Laravel • Eloquent

Reading and writing DataObjects

DataObjects in SilverStripe represent a database table row. The fields in the model have magic methods that handle getting and setting data via their property names. Given we have a simple DataObject as an example: class Fruit extends DataObject { private static $db = ['Name' => 'Varchar'...

silverstripe • Using the ORM

A View Bound to Existing HTML

Assuming this HTML in the page: <body> <div id="myPage"> </div> </body> A view can be bound to it with: var MyPageView = Backbone.View.extend( { "el": "#myPage", "template": _.template( "<p>This is m...

backbone.js • View

View's initialize function

initialize is called by Backbone right after a View is constructed. Optional parameters The initialize function receives any arguments passed to the view's constructor. Commonly, the options hash that is used to pass the view's default options: ['model', 'collection', 'el', 'id', 'attributes', 'c...

backbone.js • View

Gem installation from github/filesystem

You can install a gem from github or filesystem. If the gem has been checked out from git or somehow already on the file system, you could install it using gem install --local path_to_gem/filename.gem Installing gem from github. Download the sources from github mkdir newgem cd newgem git clon...

Ruby Language • Gem Usage

Defining Variadic Functions

A Clojure function can be defined to take an arbitrary number of arguments, using the symbol & in its argument list. All remaining arguments are collected as a sequence. (defn sum [& args] (apply + args)) (defn sum-and-multiply [x & args] (* x (apply + args))) Calling: =&gt...

clojure • Functions

Single & Multiple line comments

Comments are programmer-readable annotations that are ignored at runtime. Their purpose is to make source code easier to understand. Single line comments The # character is used to add single line comments. #!/usr/bin/ruby -w # This is a single line comment. puts "Hello World!" Whe...

Ruby Language • Comments