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Have a reloadData for a UITableView animate when changing
...xSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationFade];
From the documentation:
Calling this method causes the table view to ask its data source for
new cells for the specified sections. The table view animates the
insertion of new cells in as it animates the old cells out...
Permanently add a directory to PYTHONPATH?
...new directory to the environment variable PYTHONPATH, separated by a colon from previous contents thereof. In any form of Unix, you can do that in a startup script appropriate to whatever shell you're using (.profile or whatever, depending on your favorite shell) with a command which, again, depend...
Why use a prime number in hashCode?
...wer of two, which permits for bitwise optimization
Here's the full quote, from Item 9: Always override hashCode when you override equals:
The value 31 was chosen because it's an odd prime. If it were even and multiplication overflowed, information would be lost, as multiplication by 2 is equivalen...
How to get rid of the 'undeclared selector' warning
...
Have a look at NSSelectorFromString.
SEL selector = NSSelectorFromString(@"setError:");
if ([self respondsToSelector:selector])
It will allow you to create a selector at runtime, instead of at compile time through the @selector keyword, and the co...
Can you write nested functions in JavaScript?
...b(y) { // <-- inner function
return x + y; // <-- use variables from outer scope
}
return b; // <-- you can even return a function.
}
console.log(a(3)(4));
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Identifying the dependency relationship for python packages installed with pip
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An updated version of the script from my previous comment is pip freeze | grep -v "\-e" | sed s/\=\=.*// | awk 'system("pip show " $1)' | grep -E '^(Name:|Requires:)' | sed s/Name:/\\\nName:/ -- but it seems that pipdeptree is now a better solution.
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What is the difference between a mutable and immutable string in C#?
...to make a copy of it if you want to be absolutely sure it won't change out from under you. This is why mutable objects are dangerous to use as keys into any form of Dictionary or set- the objects themselves could change, and the data structure would have no way of knowing, leading to corrupt data th...
JavaScript hide/show element
... It may be needed if you don't want to let JavaScript change the url from yourdomain.com/ to yourdomain.com/# ... furthermore, the scrolling of the window may jump, or any other non considered problem may occur.
– Sascha Galley
Sep 24 '11 at 0:30
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How to escape special characters in building a JSON string?
.... If you simply use language or library functions to convert things to and from JSON, you'll never even need to know JSON's escaping rules. This is what the misguided question asker here ought to have done.
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Android: show soft keyboard automatically when focus is on an EditText
...ner on the EditText on the AlertDialog, then get the AlertDialog's Window. From there you can make the soft keyboard show by calling setSoftInputMode.
final AlertDialog dialog = ...;
editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(Vi...