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Android Log.v(), Log.d(), Log.i(), Log.w(), Log.e() - When to use each one?
...ine what is considered a debug log versus informational, versus and error, etc. etc.
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Generate a heatmap in MatPlotLib using a scatter data set
...mean to be an idiot, but how do you actually have this output to a PNG/PDF file instead of only displaying in an interactive IPython session? I'm trying to get this as some sort of normal axes instance, where I can add a title, axis labels, etc. and then do the normal savefig() like I would do for a...
Why do we need the “event” keyword while defining events?
...yone can remove other people's event handlers, raise the event themselves, etc - it's an encapsulation disaster.
For more on events (and delegates) read my article on this topic. (At some point I need to update this for C# 4, which changes field-like events very slightly. The gist of it is still co...
Python assigning multiple variables to same value? list behavior
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If you're coming to Python from a language in the C/Java/etc. family, it may help you to stop thinking about a as a "variable", and start thinking of it as a "name".
a, b, and c aren't different variables with equal values; they're different names for the same identical value. Var...
How do I combine a background-image and CSS3 gradient on the same element?
...arget{ background-image: url("IMAGE_URL"); }
Background position, sizing etc.
Other properties that would apply to a single image may also be comma separated. If only 1 value is supplied, that will be applied to all stacked images including the gradient. background-size: 40px; will constrain both...
Is there hard evidence of the ROI of unit testing?
...spent learning the testing framework, writing tests, keeping them updated, etc.. will pay for itself, and then some.
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What are the basic rules and idioms for operator overloading?
...ding: If you provide +, also provide +=, if you provide -, do not omit -=, etc. Andrew Koenig is said to have been the first to observe that the compound assignment operators can be used as a base for their non-compound counterparts. That is, operator + is implemented in terms of +=, - is implemente...
Common programming mistakes for Clojure developers to avoid [closed]
...notice, because your code works at the REPL and doesn't work from a source file or inside a function.
user=> (map println [:foo :bar])
(:foo
:bar
nil nil)
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Advantages of stateless programming?
...unexpected effect on global state, or read/write the registry/environment, etc.) I would posit that at least 1 in 3 'hard bugs' fall into this category.
Now if you switch to stateless/immutable/pure programming, all those bugs go away. You are presented with some new challenges instead (e.g. when...
Facebook database design?
...d various triggers could fire to cascade events of friending, defriending, etc.
– Jesse C. Slicer
May 14 '12 at 22:05
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