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Detecting an undefined object property
... check if an object does not actually have such a property, and will therefore return undefined by default when you try and access it:
if(!o.hasOwnProperty('myProperty')) {
alert("myProperty does not exist");
}
To check if the value associated with an identifier is the special value undefined, ...
Why should we NOT use sys.setdefaultencoding(“utf-8”) in a py script?
...The encoding of py3k is hard-wired to "utf-8" and changing it raises an error.
I suggest some pointers for reading:
http://blog.ianbicking.org/illusive-setdefaultencoding.html
http://nedbatchelder.com/blog/200401/printing_unicode_from_python.html
http://www.diveintopython3.net/strings.html#one-ri...
Npm Please try using this command again as root/administrator
...
It turns out that you don’t have to run the command again as Administrator, and doing so won’t fix the problem.
Try:
npm cache clean first.
If that doesn’t fix things, take a look in %APPDATA%\npm-cache, or if you’re using PowerShell, $env:APPDATA\npm-cache.
After cleaning the cac...
How to define custom configuration variables in rails
...ariables to a rails application and how to access them in the controller, for e.g I wanna be able to define an upload_directory in the configuration files say development.rb and be able to access it in one of my controllers.
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Does Git publicly expose my e-mail address?
... into the config and specify my name and my e-mail address. They don't elaborate; they just say to do it.
8 Answers
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git --git-dir not working as expected
I am trying to run git from a different directory than I am in. So for example if I am in:
4 Answers
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The 3 different equals
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You have = the assignment operator, == the 'equal' comparison operator and === the 'identical' comparison operator.
$a = $b Assign Sets $a to be equal to $b.
$a == $b Equal TRUE if $a is equal to $b.
$a === $b Identical TRUE if $a is ...
PHP expresses two different strings to be the same [duplicate]
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"608E-4234" is the float number format, so they will cast into number when they compares.
608E-4234 and 272E-3063 will both be float(0) because they are too small.
For == in php,
If you compare a number with a string or the comparison involves
numer...
How do I exit from the text window in Git?
I am using Windows and before committing, Git wants me to enter a text message and a new text window appears.
7 Answers
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What does java:comp/env/ do?
I just spent too much time of my day trying to figure out some errors when hooking up some JNDI factory bean. The problem turned out to be that instead of this...
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