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Unique BooleanField value in Django?
...side the if statement along with saving inside the if. Then adding an else block and also saving in the else block.
– alexbhandari
Aug 11 '19 at 20:07
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How do I break out of a loop in Scala?
...-too-easy for at least three reasons I can think of. First, in large code blocks, it's easy to overlook "continue" and "break" statements, or to think you're breaking out of more or less than you really are, or to need to break two loops which you can't do easily anyway--so the standard usage, whil...
Is there any way to delete local commits in Mercurial?
...red Feb 26 '10 at 2:02
too much phptoo much php
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iOS: How does one animate to new autolayout constraint (height)
... @ngb you need to change the constraint constant inside the animation block. That way the constraint changes with the animation and you can keep using UIViewAnimationOptionBeginFromCurrentState.
– Eran Goldin
Apr 13 '15 at 11:16
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Determine if variable is defined in Python [duplicate]
...eleted. I'm looking for something like defined() in Perl or isset() in PHP or defined? in Ruby.
6 Answers
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Where are static variables stored in C and C++?
...ther they are zero-initialized. zero-initialized static data goes in .BSS (Block Started by Symbol), non-zero-initialized data goes in .DATA
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Check if an array is empty or exists
...iable hoisting. Make sure you use var whenever declaring a variable:
<?php echo "var image_array = ".json_encode($images);?>
// add var ^^^ here
And then make sure you never accidently redeclare that variable later:
else {
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image_array = []; // no var here
}
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When would I use XML instead of SQL? [closed]
...used, which is storing all of my data in a (My)SQL database and then using PHP/Python/etc. to work with it on the web as needed.
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What exactly is an Assembly in C# or .NET?
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http://www.codeguru.com/columns/csharp_learning/article.php/c5845
An assembly is a file that is automatically generated by the compiler upon successful compilation of every .NET application. It can be either a Dynamic Link Library or an executable file. It is generated only once ...
What are the barriers to understanding pointers and what can be done to overcome them? [closed]
...mes to copying pointer values around and still referencing the same memory block.
I've found that the best analogy is to consider the pointer as a piece of paper with a house address on it, and the memory block it references as the actual house. All sorts of operations can thus be easily explained....