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Best practices for overriding isEqual: and hash
...ive you do
result = prime * result + var
For objects you use 0 for nil and otherwise their hashcode.
result = prime * result + [var hash];
For booleans you use two different values
result = prime * result + ((var)?1231:1237);
Explanation and Attribution
This is not tcurdt's work, and ...
Big-oh vs big-theta [duplicate]
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Big-O is an upper bound.
Big-Theta is a tight bound, i.e. upper and lower bound.
When people only worry about what's the worst that can happen, big-O is sufficient; i.e. it says that "it can't get much worse than this". The tighter the bound the better, of course, but a tight bound isn't...
Difference between numeric, float and decimal in SQL Server
What are the differences between numeric , float and decimal datatypes and which should be used in which situations?
8...
What does enumerate() mean?
...is produced with (counter, element); the for loop binds that to row_number and row, respectively.
Demo:
>>> elements = ('foo', 'bar', 'baz')
>>> for elem in elements:
... print elem
...
foo
bar
baz
>>> for count, elem in enumerate(elements):
... print count, ele...
master branch and 'origin/master' have diverged, how to 'undiverge' branches'?
Somehow my master and my origin/master branch have diverged.
I actually don't want them to diverge.
13 Answers
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How to prevent the activity from loading twice on pressing the button
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In the button's event listener, disable the button and show another activity.
Button b = (Button) view;
b.setEnabled(false);
Intent i = new Intent(this, AnotherActitivty.class);
startActivity(i);
Override onResume() to re-enable the button.
@Override
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Getting the count of unique values in a column in bash
...currence of the different values in a column for all the files in a folder and sort them in decreasing order of count (highest count first). How would I accomplish this in a Linux command line environment?
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List of Big-O for PHP functions
...ght it'd be good idea to have it for reference somewhere. I've gone though and either via benchmark or code-skimming to characterize the array_* functions. I've tried to put the more interesting Big-O near the top. This list is not complete.
Note: All the Big-O where calculated assuming a hash look...
Change the current directory from a Bash script
...d /proc
}
The reason is that each process has its own current directory, and when you execute a program from the shell it is run in a new process. The standard "cd", "pushd" and "popd" are builtin to the shell interpreter so that they affect the shell process.
By making your program a shell funct...
How to print a debug log?
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A lesser known trick is that mod_php maps stderr to the Apache log. And, there is a stream for that, so file_put_contents('php://stderr', print_r($foo, TRUE)) will nicely dump the value of $foo into the Apache error log.
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