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How can I detect if a selector returns null?
...answer, but it would be helpful if you explain what happens if NONE of the tested elements exists. Short answer: TypeError: firstExistingElement.doSomething is not a function. You can wrap the entire variable assignment/test in an if() and only do something if an element is found....
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Skip List vs. Binary Search Tree
... locked.
Update from Jon Harrops comments
I read Fraser and Harris's latest paper Concurrent programming without locks. Really good stuff if you're interested in lock-free data structures. The paper focuses on Transactional Memory and a theoretical operation multiword-compare-and-swap MCAS. B...
For..In loops in JavaScript - key value pairs
...ly or with Babel (js compiler) then you could do the following:
const test = {a: 1, b: 2, c: 3};
for (const [key, value] of Object.entries(test)) {
console.log(key, value);
}
Which will print out this output:
a 1
b 2
c 3
The Object.entries() method returns an array of a given o...
Android 4.3 Bluetooth Low Energy unstable
...am currently developing an application that will use Bluetooth Low Energy (testing on the Nexus 4). After getting started with the official BLE APIs in Android 4.3, I have noticed that after I connect a device for the first time I am rarely able to successfully connect to / communicate with that dev...
Controlling mouse with Python
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Tested on WinXP, Python 2.6 (3.x also tested) after installing pywin32 (pywin32-214.win32-py2.6.exe in my case):
import win32api, win32con
def click(x,y):
win32api.SetCursorPos((x,y))
win32api.mouse_event(win32con.MO...
Which browsers support ?
...here: http://wiki.whatwg.org/wiki/Dynamic_Script_Execution_Order
Also, to test if a browser supports the new dynamic async property behavior: http://test.getify.com/test-async/
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Check list of words in another string [duplicate]
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If your list of words is of substantial length, and you need to do this test many times, it may be worth converting the list to a set and using set intersection to test (with the added benefit that you wil get the actual words that are in both lists):
>>> long_word_list = 'some one long...
How to remove the arrow from a select element in Firefox
...uch help, I thought it was about time I give something back.
I have only tested it in firefox (mac) version 18, and then 22 (after I updated).
All feedback is welcome.
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Error: «Could not load type MvcApplication»
...evious version of the project which had a different name. So the namespace Test should have been namespace Test.WebUI. A silly mistake of course and am a bit embarrassed to write this! But writing in the hope that a similar error from anyone else may lead him to check this trivial aspect as well.
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How to check if a variable is not null?
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Here is how you can test if a variable is not NULL:
if (myVar !== null) {...}
the block will be executed if myVar is not null.. it will be executed if myVar is undefined or false or 0 or NaN or anything else..
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