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Fastest way to determine if an integer is between two integers (inclusive) with known sets of values
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There's an old trick to do this with only one comparison/branch. Whether it'll really improve speed may be open to question, and even if it does, it's probably too little to notice or care about, but when you're only starting with two comparisons, the chances of a hu...
How to ssh to vagrant without actually running “vagrant ssh”?
...ecure_private_key \
vagrant@localhost \
-p $PORT \
"$@"
As a one-liner (with thanks to kgadek):
ssh $(vagrant ssh-config | awk 'NR>1 {print " -o "$1"="$2}') localhost
To account for when you have more than one vagrant host, this will select the desired host, as well as cull blank...
What is this operator in MySQL?
... Not at all; <=> takes two operands whereas IS (NOT) NULL only takes one; big difference ... it's as useful as = itself in that respect.
– Ja͢ck
Feb 21 '14 at 8:20
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Is there a native jQuery function to switch elements?
... this way is inserted elsewhere, it will be moved before the target (not cloned)".
– Ridcully
Jan 11 '12 at 15:55
12
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Similar to jQuery .closest() but traversing descendants?
...ry .closest() but for traversing descendants and returning only closest ones?
16 Answers
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Custom domain for GitHub project pages
I have a gh-pages branch in one of my http://github.com repos. The GitHub project pages works fine if I go to http://myuser.github.com/myrepo
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How can you do anything useful without mutable state?
...ut functional programming lately, and I can understand most of it, but the one thing I just can't wrap my head around is stateless coding. It seems to me that simplifying programming by removing mutable state is like "simplifying" a car by removing the dashboard: the finished product may be simpler...
SQL - find records from one table which don't exist in another
...two tables:
This is the shortest statement, and may be quickest if your phone book is very short:
SELECT *
FROM Call
WHERE phone_number NOT IN (SELECT phone_number FROM Phone_book)
alternatively (thanks to Alterlife)
SELECT *
FROM Call
WHERE NOT EXISTS
(SELECT *
FROM Phone_book
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How to set the java.library.path from Eclipse
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But how does this work if you have more than one folder to add?
– Dan
Jun 30 '10 at 11:57
2
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Is #pragma once a safe include guard?
...eason not to use a standard #ifndef include guard. It works just fine. The one caveat is that GCC didn't support #pragma once before version 3.4.
I also found that, at least on GCC, it recognizes the standard #ifndef include guard and optimizes it, so it shouldn't be much slower than #pragma once.
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