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Check if object exists in JavaScript
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You can safely use the typeof operator on undefined variables.
If it has been assigned any value, including null, typeof will return something other than undefined. typeof always returns a string.
Therefore
if (typeof maybeObject != "undefined") {
alert("...
How can I setup & run PhantomJS on Ubuntu?
I set up PhantomJS and recorded it to video: https://www.dailymotion.com/video/xnizmh_1_webcam
25 Answers
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how to use python to execute a curl command
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For sake of simplicity, maybe you should consider using the Requests library.
An example with json response content would be something like:
import requests
r = requests.get('https://github.com/timeline.json')
r.json()
If ...
Sending files using POST with HttpURLConnection
...e me with a good example on how to send a bitmap "file" (actually an in-memory stream) via POST to an Apache HTTP server. I'm not interested in cookies or authentication or anything complicated, but I just want to have a reliable and logic implementation. All the examples that I've seen around here ...
Create an instance of a class from a string
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Take a look at the Activator.CreateInstance method.
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Cast List to List
...You can't cast it (preserving reference identity) - that would be unsafe. For example:
public interface IFruit {}
public class Apple : IFruit {}
public class Banana : IFruit {}
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List<Apple> apples = new List<Apple>();
List<IFruit> fruit = apples; // Fortunately not allowed
f...
Validating email addresses using jQuery and regex
...osofi.com/jquery-validate-e-mail-address-regex/
using new regex
added support for Address tags (+ sign)
function isValidEmailAddress(emailAddress) {
var pattern = /^([a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]+(\.[a-z\d!#$%&'*+\-\/=?^_`{|}~\u00A0-\uD7FF\uF900...
C++: what regex library should I use? [closed]
I'm working on a commercial (not open source) C++ project that runs on a linux-based system. I need to do some regex within the C++ code. (I know: I now have 2 problems.)
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How do I schedule jobs in Jenkins?
...o schedule your build every day at 8h00, this will do the job : 0 8 * * *
For the past few versions (2014), Jenkins have a new parameter, H (extract from the Jenkins code documentation):
To allow periodically scheduled tasks to produce even load on the system, the symbol H (for “hash”) should b...
Android Studio says “cannot resolve symbol” but project compiles
I'm importing twitter4j in AndroidStudio, using the following in my build.gradle:
27 Answers
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