Tutorial by Examples: me

Since Groovy 1.8 a convenient memoize() method is added on closures: // normal closure def sum = { int x, int y -> println "sum ${x} + ${y}" return x + y } sum(3, 4) sum(3, 4) // prints // sum 3 + 4 // sum 3 + 4 // memoized closure def sumMemoize = sum.memoize() ...

Since Groovy 2.2 groovy.transform.Memoized annotation is added to convenient memoize methods with simply adding the @Memoized annotation: import groovy.transform.Memoized class Calculator { int sum(int x, int y){ println "sum ${x} + ${y}" return x+y } ...

public ActionResult Details( string product) { .... if (productNotFound) { // http://www.eidias.com/blog/2014/7/2/mvc-custom-error-pages Response.Clear(); Response.TrySkipIisCustomErrors = true; Response.Write(product + " product not exists"); ...

r.connect({host: 'localhost', port: 28015}) .then((conn) => { return r.db("stackoverflow").table("examples") .insert({ // If `id` is not set, will automatically generate a UUID id: 1, name: 'Thinker', // Wi...

r.connect({host: 'localhost', port: 28015}) .then((conn) => { // Can also use .get({id: 1}) return r.db("stackoverflow").table("examples").get(1).run(conn) }).then((result) => { console.log(result); })

import pygame background_colour = (255,255,255) # For the background color of your window (width, height) = (300, 200) # Dimension of the window screen = pygame.display.set_mode((width, height)) # Making of the screen pygame.display.set_caption('Tutorial 1') # Name for the window screen.fil...

How to implement FirebaseRealTime database in android application. Following is the steps for do it. First install firebase sdk, If you dont know how to install then following is the URL for help. Install Firebase SDK After thet register your project in firbase console, URL of the firbas...

Imagine the following XML: <root> <element foobar="hello_world" /> <element example="this is one!" /> </root> /root/element[@foobar] and will return the <element foobar="hello_world" /> element.

Imagine the following XML: <root> <element foobar="hello_world" /> <element example="this is one!" /> </root> The following XPath expression: /root/element[@foobar = 'hello_world'] will return the <element foobar="hello_world&quo...

1-HTTP Server. For example: Apache. Having mod_rewrite is preferred, but by no means required. 2-PHP 5.5.9 or greater (including PHP 7) 3-mbstring PHP extens ion 4-intl PHP extension I usually make an apache and mysql installation on a linuxbox. I can use windows too, however I do not recommen...

OpenCL is low level api so it must be implemented in "C space" first. For that, one needs to download header files from Khronos' site. My hardware is AMD and capable of version 1.2, downloading opencl.h cl_platform.h cl.h cl_ext.h cl_egl.h cl_dx9_media_sharing.h cl_d3d10.h c...

XML <House> <numRooms>4</numRooms> <Room name="living"/> <Room name="master bedroom"/> <Room name="kids' bedroom"/> <Room name="kitchen"/> </House> XPATH /House/child::Room or /...

During a review, user has the possibility to add comments to explain his point of view. There is several kind of comments Comment a file : The yellow symbol allow user to add comment on entire file Line comment : Click the line number to comment it Word selection : The last option i...

1.Download font-awesome from here. 2.Copy the font-awesome directory into your project. 3.In the of your html, reference the location to your font-awesome.min.css. <link rel="stylesheet" href="path/to/bootstrap/css/bootstrap.min.css"> <link rel="stylesheet&quot...

When you are getting started with ElasticSearch (ES) it might be good to have a graphical tool that helps you explore your data. A plugin called elasticsearch-head does just that. To install it, do the following: Find out in which folder ES is installed: ls -l $(which elasticsearch) cd into this...

The Firebase auth system is the source of a users uid, displayName, photoURL, and maybe email. Password based accounts set these persistent values in the auth system via the .updateProfile method. Storing these values in the Realtime Database, rDB, users node poses the issue of stale data. Displa...

QML came with rich set of visual elements. Using only QML we can build complex applications with these elements. Also it's very easy to build your own element based on set of standard items like Rectangle, Button, Image etc. Moreover, we can use items like Canvas to build element with custom paint...

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A DataFrame is a distributed collection of data organized into named columns. It is conceptually equivalent to a table in a relational database. DataFrames can be constructed from a wide array of sources such as: structured data files, tables in Hive, external databases, or existing RDDs. Reading a...

class MyClass { private String privateField } def prvtClss = new MyClass(privateField: 'qwerty') println prvtClss.privateField will print us 'qwerty' This issue is known since version 1.1 and there is a bug report on that: http://jira.codehaus.org/browse/GROOVY-1875. It is not reso...