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How to modify existing, unpushed commit messages?
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…however, this can make multi-line commit messages or small corrections more cumbersome to enter.
Make sure you don't have any working copy changes staged before doing this or they will get committed too. (Unstaged changes will not get committed.)
Changing the message of a commit that you've alre...
Python Sets vs Lists
In Python, which data structure is more efficient/speedy? Assuming that order is not important to me and I would be checking for duplicates anyway, is a Python set slower than a Python list?
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Difference between \b and \B in regex
...ght.
On the other hand, when searching for \bcat\b word boundaries behave more intuitively, and it matches " cat " as expected.
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How to swap two variables in JavaScript
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How to count instances of character in SQL Column
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Just be aware that if there are more than "N" or "Y" in the string then this could be inaccurate. See nickf's solution for a more robust method.
– Tom H
Dec 7 '09 at 15:28
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How can I start PostgreSQL server on Mac OS X?
...brew package manager includes launchctl plists to start automatically. For more information, run brew info postgres.
Start manually
pg_ctl -D /usr/local/var/postgres start
Stop manually
pg_ctl -D /usr/local/var/postgres stop
Start automatically
"To have launchd start postgresql now and restart at lo...
Avoid synchronized(this) in Java?
...r lock (very popular this one, also has an
"accidentally" variant)
I'm more worried about accidentally. What it amounts to is that this use of this is part of your class' exposed interface, and should be documented. Sometimes the ability of other code to use your lock is desired. This is true...
Swift - How to convert String to Double
... converted (i.e.: bad user input).
let lessPrecisePI = Float("3.14")
let morePrecisePI = Double("3.1415926536")
let invalidNumber = Float("alphabet") // nil, not a valid number
Unwrap the values to use them using if/let
if let cost = Double(textField.text!) {
print("The user entered a valu...
Find and Replace Inside a Text File from a Bash Command
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How can I run an external command asynchronously from Python?
...r stderr pipe such that it blocks waiting for the OS pipe buffer to accept more data. Use communicate() to avoid that. "
– Ali Afshar
Mar 11 '09 at 22:12
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