Tutorial by Examples: w

When reading a potentially large file, a while loop has a significant memory advantage over foreach. The following will read the file record by record (by default, "record" means "a line", as specified by $/), assigning each one to $_ as it is read: while(<$fh>) { pri...

Sometimes it is necessary to assert when an exception is thrown. Different unit testing frameworks have different conventions for asserting that an exception was thrown, (like NUnit's Assert.Throws method). This example does not use any framework specific methods, just built in exception handling. ...

docker network create --subnet=192.168.0.0/24 --gateway=192.168.0.1 --ip-range=192.168.0.0/25 local-host-restricted iptables -I INPUT -s 192.168.0.0/24 -m addrtype --dst-type LOCAL -j DROP Creates a network called local-host-restricted which which: Blocks Access to host running docker daem...

Such Example is knowing wide spreading among PWAs (Progressive Web Applications) and in this example we're going to send a simple Backend like notification using NodeJS and ES6 Install Node-GCM Module : npm install node-gcm Install Socket.io : npm install socket.io Create a GCM Enable...

AWK is string manipulation language, used largely in UNIX systems. The idea behind AWK was to create a versatile language to use when working on files, which wasn't too complex to understand. AWK has some other variants, but the main concept is the same, just with additional features. These other v...

Make sure that the NodeJS plugin is enabled Select your run configurations (screen) Select + > Node.js Remote Debug Make sure you enter the port selected above as well as the correct host Once those are configured simply run the debug target as you normally would and it will...

import tkinter as tk root = tk.Tk() rbvar = StringVar() rbvar.set(" ") rb1 = tk.Radiobutton(root, text="Option 1", variable=rbvar, value='a', indicatoron=0) rb1.pack() rb2 = tk.Radiobutton(root, text="Option 2", variable=rbvar, value='b', indicatoron=0) rb2...

How to implement Firebase Real-Time database in Android applications. Setup/Installation: First, install the Firebase SDK (guide) Register your project using the Firebase console After successfuly completing the two steps above, add the following dependency in your application level ...

NOTE This page illustrates use of gulp plugins like browser-sync , gulp-watch and run-sequence , and continues discussing gulp-workflow-automation from where we left off at Gulpjs-workflow-automation-1 of 2. In case you landed here , consider going through that post first. Default Task ...

Go to File -> Switch Workspace -> Other... and type in your new workspace name.

Mvvmcross is an open source MVVM platform that comes to solve our problems while developing cross platform applications (such as Android, Windows Phone, IOS, etc...). The main problem is, that every platform has its own specifics, but the business logic of your application is likely to be the same ...

First off you create the form @using (Html.BeginForm()) { @Html.AntiForgeryToken() } Action Method [HttpPost] [ValidateAntiForgeryToken] public ActionResult Test(FormViewModel formData) { // ... } Script <script src="https://code.jquery.com/jquery-1.12.4.min.js"&g...

Data Access Object(DAO) design pattern is a standard J2EE design pattern. In this design pattern data is accessed through classes containing methods to access data from databases or other sources, which are called data access objects. Standard practice assumes that there are POJO classes. DAO can b...

page.js var context = { items: [ {id: 1, name: "Foo"}, {id: 2, name: "Bar"}, {id: 3, name: "Joe"} ] } exports.loaded = function(args){ var page = args.object; page.bindingContext = context; } exports.showEntry = functi...

Achieving multitenancy on database server with multiple databases hosted on it. Multitenancy is common requirement of enterprise application nowadays and creating connection pool for each database in database server is not recommended. so, what we can do instead is create connection pool with datab...

When you call store.dispatch(actionObject) it is handled synchronously. I.e. reducers would be called and your store listeners would be notified, your react views would be re-rendered on each dispatched action. Middleware is what enables you to delay dispatching or even dispatch different actions ...

import pandas as pd data = [ {'name': 'Daniel', 'country': 'Uganda'}, {'name': 'Yao', 'country': 'China'}, {'name': 'James', 'country': 'Colombia'}, ] df = pd.DataFrame(data) filename = 'people.csv' df.to_csv(filename, index=False, encoding='utf-8')

REpresentational State Transfer (REST) is an architectural style used for web development, introduced and defined in 2000 by Roy Fielding. See it on wiki : REST wiki It's based on HTTP protocol (HTTP on Wiki), HTTP requests (GET, POST, PATCH, DELETE...) / responses codes (404, 400, 200, 201, 500.....

This example shows how you can use IIS Rewrite rules to force HTTPS by making all HTTP requests return a 301 (Permanent) Redirect to the HTTPS page. This is usually better than using the [RequireHttps] attribute because the attribute uses a 302 redirect, and being in the MVC pipeline it is much slo...

Bootstrap provides a couple of classes for advanced table styling. Striped rows You will have a table with striped rows, if you add .table-striped class: <table class="table table-striped"> <thead><tr><th>First Name</th><th>Last name</th><...