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Collect successive pairs from a stream
Given a stream such as { 0, 1, 2, 3, 4 } ,
20 Answers
20
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How to avoid isset() and empty()
...lder applications that throw a lot of "xyz is undefined" and "undefined offset" messages when running on the E_NOTICE error level, because the existence of variables is not explicitly checked using isset() and consorts.
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JavaScript private methods
...ion() { // Only visible inside Restaurant()
myPrivateVar = "I can set this here!";
}
this.use_restroom = function() { // use_restroom is visible to all
private_stuff();
}
this.buy_food = function() { // buy_food is visible to all
private_stuff();
}
}...
What is this crazy C++11 syntax ==> struct : bar {} foo {};?
...antics is difficult. Each programmer (I am one of them) ends up using a subset of the language because there are too many different ways of doing the same thing. I do not think C++ is well-designed. There are many ad-hoc features and certain fundamental things like a robust module (import / export) ...
Will using goto leak variables?
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
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Multiple commands in gdb separated by some sort of delimiter ';'?
...B commands will allow us to enter 3 whatis requests all on a single line:
set prompt #gdb#
Any prompt whose first non-whitespace character is # will work: it just so happens that # starts a comment in GDB command scripts.
set logging overwrite on
By default, GDB appends to a log file; choosing...
Adding n hours to a date in Java?
...k.
Calendar cal = Calendar.getInstance(); // creates calendar
cal.setTime(new Date()); // sets calendar time/date
cal.add(Calendar.HOUR_OF_DAY, 1); // adds one hour
cal.getTime(); // returns new date object, one hour in the future
Check API for more.
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Symbolicating iPhone App Crash Reports
...ult release builds stripped the symbols. We can change it in project build settings "Strip Debug Symbols During Copy" to NO.
More details see this post
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Using python's eval() vs. ast.literal_eval()?
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ast.literal_eval() only considers a small subset of Python's syntax to be valid:
The string or node provided may only consist of the following Python literal structures: strings, numbers, tuples, lists, dicts, booleans, and None.
Passing __import__('os').system('r...
How to git reset --hard a subdirectory?
...would replace both the index and working tree with HEAD content, like an reset --hard would, but for a specific path.
Original answer (2013)
Note (as commented by Dan Fabulich) that:
git checkout -- <path> doesn't do a hard reset: it replaces the working tree contents with the staged co...