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How do you do relative time in Rails?
...uby newbie on how to run this in irb? I run: require 'active_support' and then try 'time_ago_in_words(Time.now)' but the function isn't found.
– cboettig
Aug 3 '12 at 0:24
2
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What's the difference between a single precision and double precision floating point operation?
...ted by the word may be determined as follows:
If E=255 and F is nonzero, then V=NaN ("Not a number")
If E=255 and F is zero and S is 1, then V=-Infinity
If E=255 and F is zero and S is 0, then V=Infinity
If 0<E<255 then V=(-1)**S * 2 ** (E-127) * (1.F) where "1.F" is
intended to represent th...
AngularJS: Service vs provider vs factory
...simply returns the value as is. But what if you want to compute the value? Then use a factory
provide.factory('b', function(a) {
return a*2;
});
function Controller(b) {
expect(b).toEqual(246);
}
So factory is a function which is responsible for creating the value. Notice that the factory func...
Bash script error [: !=: unary operator expected
...
Quotes!
if [ "$1" != -v ]; then
Otherwise, when $1 is completely empty, your test becomes:
[ != -v ]
instead of
[ "" != -v ]
...and != is not a unary operator (that is, one capable of taking only a single argument).
...
How to find the lowest common ancestor of two nodes in any binary tree?
...er algorithms you can use that require O(n) [linear] time preparation, but then finding any pair takes only O(1) [constant] time. For references to these algorithms, see the the lowest common ancestor problem page on Wikipedia. (Credit to Jason for originally posting this link)
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How to secure database passwords in PHP?
...sword. If I'm using a single, minimum-permission login for my application, then the PHP needs to know that login and password somewhere. What is the best way to secure that password? It seems like just writing it in the PHP code isn't a good idea.
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Adding Only Untracked Files
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It's easy with git add -i. Type a (for "add untracked"), then * (for "all"), then q (to quit) and you're done.
To do it with a single command: echo -e "a\n*\nq\n"|git add -i
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Mysql order by specific ID values
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You should be able to use CASE for this:
ORDER BY CASE id
WHEN 1 THEN 1
WHEN 5 THEN 2
WHEN 4 THEN 3
WHEN 3 THEN 4
ELSE 5
END
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If Python is interpreted, what are .pyc files?
... which is what the Python interpreter compiles the source to. This code is then executed by Python's virtual machine.
Python's documentation explains the definition like this:
Python is an interpreted language, as
opposed to a compiled one, though the
distinction can be blurry because of
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Get current AUTO_INCREMENT value for any table
... the environment you're running in. If it's a controlled test environment, then you could most likely add one and be safe. The best answer was provided by methai.
– jvdub
Apr 4 '13 at 21:18
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