There are four primary useful functions for regular expressions, all of which take arguments in needle, haystack order. The terminology "needle" and "haystack" come from the English idiom "finding a needle in a haystack". In the context of regexes, the regex is the need...
Visual Studio (IDE)
WPA (performance analyzer)
WinDbg (debugger)
IDA Pro (disassembler)
dotPeek (decompiler for .NET)
WinMerge (diff tool)
HxD or 010 editor (hex editor)
Speedcrunch (calculator)
Firefox (browser)
Rohitab API monitor (API call monitoring)
SOS (a WinDbg extension for .NET)...
R-markdown code chunks
R-markdown is a markdown file with embedded blocks of R code called chunks. There are two types of R code chunks: inline and block.
Inline chunks are added using the following syntax:
`r 2*2`
They are evaluated and inserted their output answer in place.
Block chunks hav...
1)First go through Paypal Developer web site and create an application.
2)Now open your manifest file and give the below permissions
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"...
Preemptive basic authentication is the practice of sending http basic authentication credentials (username and password) before a server replies with a 401 response asking for them. This can save a request round trip when consuming REST apis which are known to require basic authentication.
As descr...
Using core debugger
Node.js provides a build in non graphical debugging utility. To start the build in the debugger, start the application with this command:
node debug filename.js
Consider the following simple Node.js application contained in the debugDemo.js
'use strict';
function addTwoN...
NDB relates models as python objects, which can be stored and accessed in the Appengine NoSQL datastore, available to all AppEngine applications.
models.py
from google.appengine.ext import ndb
# https://cloud.google.com/appengine/docs/python/ndb/properties
class Series(ndb.Model):
&qu...
The first part of this example explains how to implement it. In the second, I will explain how it works. This tries to be a general example. The template for the map (see step 3) and the example functions are fully customizable.
################################# IMPLEMENTATION #####################...
Sometimes we need a visual hint to indicate the return status of previous command. The following snippet make put it at the head of the PS1.
Note that the __stat() function should be called every time a new PS1 is generated, or else it would stick to the return status of last command of your .bashr...
Express passes a next callback to every route handler and middleware function that can be used to break logic for single routes across multiple handlers. Calling next() with no arguments tells express to continue to the next matching middleware or route handler. Calling next(err) with an error will ...
Sending email is pretty simple in Go. It helps to understand the RFC 822, which specifies the style an email need to be in, the code below sends a RFC 822 compliant email.
package main
import (
"fmt"
"net/smtp"
)
func main() {
// user we are authorizing as
...
Don't want your columns to simply stack in smaller devices? Use the extra small and medium device grid classes by adding .col-xs-* .col-md-* to your columns. See the example below for a better idea of how it all works.
<!-- Stack the columns on mobile by making one full-width and the other half-...
In addition to prebuilt grid classes for fast layouts, Bootstrap includes Less variables and mixins for quickly generating your own simple, semantic layouts.
Variables
Variables determine the number of columns, the gutter width, and the media query point at which to begin floating columns. We use ...
Modal dialog components can be instantiated via jQuery with the function $('#myModal').modal(options), where $('#myModal') is a top-level reference to the specific modal dialog and options is a Javascript object specifying the modal dialog's default attributes.
The options object allows for multipl...
The whole ES6 spec is not yet implemented in its entirety so you will only be able to use some of the new features. You can see a list of the current supported ES6 features at http://node.green/
Since NodeJS v6 there has been pretty good support. So if you using NodeJS v6 or above you can enjoy usi...
The background script is like any other JavaScript code. You can debug it using same tools you debug other JavaScript code in Chrome.
To open the Chrome Developer Tools, go to chrome://extensions, and turn on Developer mode:
Now you can debug any extension that have a background page or script. ...
You have 2 ways to debug the popup window. Both ways are by using the Chrome DevTools.
Option 1: Right click the extension's action button, and choose Inspect popup
Option 2: Open the popup window, directly in your browser as a tab.
For example, if you extension id is abcdefghijkmnop, and your ...
You might have realized that $emit is scoped to the component that is emitting the event. That's a problem when you want to communicate between components far from one another in the component tree.
Note: In Vue1 you coud use $dispatch or $broadcast, but not in Vue2. The reason being that it doesn'...
