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What is an existential type?
... because of the existential operator (∃). I'm not sure what the point of it is, though. What's the difference between
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Why should I learn Lisp? [closed]
...earn Lisp and there are plenty of good resources out there to help me do it.
29 Answers
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How to track untracked content?
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You have added vendor/plugins/open_flash_chart_2 as “gitlink” entry, but never defined it as a submodule. Effectively you are using the internal feature that git submodule uses (gitlink entries) but you are not using the submodule feature itself.
You probably did something l...
When should one use final for method parameters and local variables?
...rameters and local variables, not final methods or classes. For constants, it makes obvious sense.
15 Answers
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Make sure only a single instance of a program is running
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The following code should do the job, it is cross-platform and runs on Python 2.4-3.2. I tested it on Windows, OS X and Linux.
from tendo import singleton
me = singleton.SingleInstance() # will sys.exit(-1) if other instance is running
The latest code version ...
Default background color of SVG root element
...ugh as most browsers are targetting SVG 1.1 at this time. Opera implements it FWIW.
A more cross-browser solution currently would be to stick a <rect> element with width and height of 100% and fill="red" as the first child of the <svg> element, for example:
<rect width="100%" height...
How does a Java HashMap handle different objects with the same hash code?
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A hashmap works like this (this is a little bit simplified, but it illustrates the basic mechanism):
It has a number of "buckets" which it uses to store key-value pairs in. Each bucket has a unique number - that's what identifies the bucket. When you put a key-v...
Python Infinity - Any caveats?
So Python has positive and negative infinity:
5 Answers
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is it possible to update UIButton title/text programmatically?
...change some settings. When the view is dismissed, I'd like to update the title/text of the UIButton to reflect the new state. I'm calling:
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Is PHP compiled or interpreted?
...nguage. The binary that lets you interpret PHP is compiled, but what you write is interpreted.
You can see more on the Wikipedia page for Interpreted languages
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