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typeof !== “undefined” vs. != null
...= undefined_check;
}
This works because when someone writes undefined = "foo" he only lets the name undefined reference to a new value, but he doesn't change the actual value of undefined.
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Emacs bulk indent for Python
...d-pasted the following literal and need it to be re-indented sensibly:
foo = {
'bar' : [
1,
2,
3 ],
'baz' : {
'asdf' : {
'banana' : 1,
'apple' : 2 } } }
It feels like M-x indent-region should do something sensibly in python-mode, but that's not (yet...
Is it acceptable and safe to run pip install under sudo?
...ry (cd /tmp), the IOError does not occur anymore if I run sudo pip install foo.
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Create subdomains on the fly with .htaccess (PHP)
...ou mean by that. If you mean, every time someone on the internet looks up foo.somedomain.com and it isn't cached, their DNS server has to resolve it, then yes.
– chaos
Feb 25 '09 at 14:26
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What is the difference between require() and library()?
...nd use its exports in line 500, you’ll get an error message “object ‘foo’ not found” in line 500, rather than an error “there is no package called ‘bla’”.
The only acceptable use case of require is when its return value is immediately checked, as some of the other answers show. Thi...
JavaScript function in href vs. onclick
... the DOM node with obj = document.getElementById(), then set obj.onclick = foo
– Matt Bridges
Jul 1 '09 at 19:24
1
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What is the IntelliJ shortcut to create a local variable?
...rl + space or enter.
It even works inside other statements. For example:
foo.someMethod(myObject.getValue().var);
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How can I search Git branches for a file or directory?
...eads`; do
echo $branch :; git ls-tree -r --name-only $branch | grep '<foo>'
done
The advantage of this is that you can also search with regular expressions for the file name.
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impro...
What are best practices for validating email addresses on iOS 2.0
...as an email address?
99% of of email addresses look like this: bob.smith@foo.com or fred@bla.edu
However, it's technically legal to have an email address like this: f!#$%&'*+-/=?^_{|}~"ha!"@com
There are probably only a handful of valid emails in the world for top-level domains, and almost n...
How to split a string in Java
...ain(String[] args) {
checkString("123-4567");
checkString("foo-bar");
checkString("123-");
checkString("-4567");
checkString("123-4567-890");
}
}
As the pattern is fixed in this instance, it can be compiled in advance and stored as a static member (initi...