Tutorial by Examples: d

Copy a dictionary

A dictionary object has the method copy. It performs a shallow copy of the dictionary. >>> d1 = {1:[]} >>> d2 = d1.copy() >>> d1 is d2 False >>> d1[1] is d2[1] True

Python Language • Copying data

Option Module enables Railway Oriented Programming

Error handling is important but can make an elegant algorithm into a mess. Railway Oriented Programming (ROP) is used to make error handling elegant and composable. Consider the simple function f: let tryParse s = let b, v = System.Int32.TryParse s if b then Some v else None let f (g : ...

F# • Option types

Update a Node

MATCH (n) WHERE n.some_attribute = "some identifier" SET n.other_attribute = "a new value"

neo4j • Cypher

Colliders

Box Collider A primitive Collider shaped like a cuboid. Properties Is Trigger - If ticked, the Box Collider will ignore physics and become a Trigger Collider Material - A reference, if specified, to the physics material of the Box Collider Center - The Box Collider's central posit...

unity3d • Collision

Build your own Linq operators for IEnumerable

One of the great things about Linq is that it is so easy to extend. You just need to create an extension method whose argument is IEnumerable<T>. public namespace MyNamespace { public static class LinqExtensions { public static IEnumerable<List<T>> Batch<T&...

C# Language • LINQ Queries

Share information between different pages

One of the easiest examples of using shared services is when we want to store some data from a given page of our application, and then get that data again but from another page. One option could be to send that data as a parameter (for instance, if one page calls the other one) but if we want to us...

ionic2 • Using Services

Import data from RDBMS to HBase table

The following sqoop command will be used to import the data from RDBMS table into HBase table, if the table does not exists in HBase it will create a new table and import the data into this table sqoop import \ --query 'select emp_id, emp_name, emp_sal from employee where $CONDITIONS' \ ...

sqoop • Connecting Sqoop to other databases/datastores

Remove extra paddings to fit to a precisely measured text.

UITextView has extra paddings by default. Sometimes it's annoying especially if you want to measure some text without view instance and place them at some area precisely. Do this to remove such paddings. messageTextView.textContainerInset = UIEdgeInsetsZero messageTextView.textContainer.lineFragm...

iOS • UITextView

Do-while

Do-while-loops execute a body expression at least once, and then keep executing it as long as the loop condition evaluates to true. A do-while-loop which logs numbers in range 10 to 0 (inclusive) can be written as follows: var i = 10; do { trace(i); } while (i-- > 0); Try the example ...

haxe • Loops

Uploading a Conda Package

Before starting you must have: Anaconda installed on your system Account on Binstar If you are not using Anaconda 1.6+ install the binstar command line client: $ conda install binstar $ conda update binstar If you are not using Anaconda the Binstar is also available on pypi: $ pip install bin...

Python Language • Deployment

Lambda - Listener Example

Anonymous class listener Before Java 8, it’s very common that an anonymous class is used to handle click event of a JButton, as shown in the following code. This example shows how to implement an anonymous listener within the scope of btn.addActionListener. JButton btn = new JButton("My Butto...

Java Language • Lambda Expressions

Hello Web (Basic "Hello World"-type setup)

<html> <head> <script src="https://code.jquery.com/jquery-3.1.0.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> <script src="https:...

backbone.js • Getting started with backbone.js

Reading the response

response = requests.get("https://api.github.com/events") text_resp = response.text JSON response: for json-formatted responses the package provides a built-in decoder response = requests.get('https://api.github.com/events') json_resp = response.json() This method will raise a Valu...

python-requests • Getting started with python-requests

Reading status codes

The attribute status_code contains the status code of the response good_req = requests.get('https://api.github.com/events') code_200 = good_req.status_code notfound_req = requests.get('https://api.github.com/not_found') code_404 = notfound_req.status_code requests.codes.__dict__ will provid...

python-requests • Getting started with python-requests

Generating model from database

In Visual Studio go to your Solution Explorer then click on Project you will be adding model Right mouse. Choose ADO.NET Entity Data Model Then choose Generate from database and click Next in next window click New Connection... and point to the database you want to generate model from (Could be M...

Entity Framework • Database first model generation

Show month and year dropdown

jQuery datepicker has two options to allow displaying dropdowns for month and year selection. These options make navigation through large timeframes easier. <input type="text" id="datepicker"> <script> $("#datepicker").datepicker({ changeMont...

jQuery UI Library • Datepicker

Deferring operations using $q.defer

We can use $q to defer operations to the future while having a pending promise object at the present, by using $q.defer we create a promise that will either resolve or reject in the future. This method is not equivalent of using the $q constructor, as we use $q.defer to promisify an existing routin...

AngularJS • Angular promises with $q service

Exclude category from posts list edit share

add_action( 'pre_get_posts', 'single_category_exclude' ); function single_category_exclude( $query ) { if( !$query->is_main_query() || is_admin() ) return; $query->set( 'cat', '-1' ); return; }

WordPress • Alternating main loop (pre_get_posts filter)

Checking if an Email Address appears in a list of addresses

Let's say you need to check if an email address appears in a long list of email addresses. Use the MATCH function to return the row number on which the email address can be found. If there is no match, the function returns an #N/A error. =MATCH(F2,$D$2:$D$200,0) The value you're retrieving ...

excel • MATCH function

Query from XML Data Type

DECLARE @xmlIN XML = '<TableData> <aaa Main="First"> <row name="a" value="1" /> <row name="b" value="2" /> <row name="c" value="3" /> </aaa> <aaa Main="Second"> &l...

SQL • XML