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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?
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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...
How to do a GitHub pull request
...st from that branch, rebasing it on top of origin/master (making sure your patch is still working) will update the pull request automagically (no need to click on anything)
update that branch: if your pull request is rejected, you simply can add new commits, and/or redo your history completely: it w...
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...
What is the significance of ProjectTypeGuids tag in the visual studio project file
... {3AC096D0-A1C2-E12C-1390-A8335801FDAB}
Solution Folder {2150E333-8FDC-42A3-9474-1A3956D46DE8}
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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 is “final” not allowed in Java 8 interface methods?
... all, or replace existing entries in the vtable (see klassVtable.cpp. Line 333), and similarly, default methods are replacing existing entries in the vtable (see klassVtable.cpp, Line 202). So the actual reason (and thus, the answer) must be hidden deeper inside the (rather complex) method call reso...
Python: How would you save a simple settings/config file?
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aaronaaron
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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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