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How can I check for “undefined” in JavaScript? [duplicate]
...d = "foo";
"foo" == undefined // true
As @CMS pointed out, this has been patched in ECMAScript 5th ed., and undefined is non-writable.
if (window.myVar) will also include these falsy values, so it's not very robust:
false
0
""
NaN
null
undefined
Thanks to @CMS for pointing out that your third...
How do I convert a Ruby class name to a underscore-delimited symbol?
...
If you don't want to install ActiveSupport just for that, you can monkey-patch underscore into String yourself (the underscore function is defined in ActiveSupport::Inflector):
class String
def underscore
word = self.dup
word.gsub!(/::/, '/')
word.gsub!(/([A-Z]+)([A-Z][a-z])/,'\1_\2...
Is there a regular expression to detect a valid regular expression?
...th regular languages, being recursive or having balancing groups is just a patch.
The language that defines valid regexes is actually a context free grammar, and you should use an appropriate parser for handling it. Here is an example for a university project for parsing simple regexes (without mos...
Get Android API level of phone currently running my application [duplicate]
... @JacksOnF1re Android 5.1.1 doesn't have its own API level, it is just a patch version atop version 22 (Lollipop MR1).
– wkl
Nov 4 '15 at 19:23
2
...
Forgot “git rebase --continue” and did “git commit”. How to fix?
... Either you can tag like @MatrixFrog says or you can save it as a patch too. Then do the rebase abort. Check the status to make sure the repo is in a state that you know had no problems and then start the fetch and rebase.
– yasouser
Jun 23 '11 at 17:3...
Why git can't do hard/soft resets by path?
...gt;:
git reset [-q] [<tree-ish>] [--] <paths>..
git reset (--patch | -p) [<tree-ish>] [--] [<paths>...]
1 is commit-wise: Operates on all files in the referenced <commit>, and may affect the working tree:
git reset [<mode>] [<commit>]
There's no mode...
JSON, REST, SOAP, WSDL, and SOA: How do they all link together
...emented by different HTTP Verbs(GET for Reading, POST for Creation, PUT or PATCH for Updating and DELETE for Deleting the desired document) , They are based on HTTP protocol and most of times the response is in JSON or XML format. On the other hand the client application have to exactly call the rel...
How to define a function in ghci across multiple lines?
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See here for the patch to define a new continuation prompt ghc.haskell.org/trac/ghc/ticket/7509#no1
– karakfa
Jun 18 '14 at 13:22
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Calling virtual functions inside constructors
... the compiler would add code to walk the vtable and look for this case and patch things then? I've never written a C++ compiler and I'm quite sure my initial comment to give this some "love" was naive and this will never happen. :-) A virtual initialize() function isn't a very painful workaround ...
Firing a double click event from a WPF ListView item using MVVM
...a real headache. It's like being asked to code with 1 arm, 1 eye on an eye patch, and standing on 1 leg. Double click should be simple, and I don't see how all this additional code is worth it.
– Echiban
Apr 25 '10 at 6:31
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