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Can someone explain this 'double negative' trick? [duplicate]
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A logical NOT operator ! converts a value to a boolean that is the opposite of its logical value.
The second ! converts the previous boolean result back to the boolean representation of its original logical value.
From these docs for the Logical NOT operator:
Returns false if ...
Why does Twitter Bootstrap Use Pixels for Font Size?
Given that Twitter Bootstrap is designed to be responsive / device-friendly, why doesn't it use relative font sizes?
5 Answ...
Seedable JavaScript random number generator
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One option is http://davidbau.com/seedrandom which is a seedable RC4-based Math.random() drop-in replacement with nice properties.
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How to check if an object is an array?
I'm trying to write a function that either accepts a list of strings, or a single string. If it's a string, then I want to convert it to an array with just the one item so I can loop over it without fear of an error.
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Inserting image into IPython notebook markdown
...eavily on the IPython notebook app to develop and document algorithms. It is awesome; but there is something that seems like it should be possible, but I can't figure out how to do it:
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Enterprise Library Unity vs Other IoC Containers [closed]
What's pros and cons of using Enterprise Library Unity vs other IoC containers (Windsor, Spring.Net, Autofac ..)?
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How to correctly save instance state of Fragments in back stack?
...().putFragment(outState, "myFragmentName", mMyFragment);
}
}
Hope this helps.
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Difference between Python's Generators and Iterators
What is the difference between iterators and generators? Some examples for when you would use each case would be helpful.
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What is the difference between shallow copy, deepcopy and normal assignment operation?
...mal assignment operations will simply point the new variable towards the existing object. The docs explain the difference between shallow and deep copies:
The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
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Using smart pointers for class members
..._ptr and shared_ptr / weak_ptr work in general. What I don't understand is the real usage. It seems like everybody recommends using unique_ptr as the way to go almost all the time. But how would I implement something like this:
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