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Picking a random element from a set
How do I pick a random element from a set?
I'm particularly interested in picking a random element from a
HashSet or a LinkedHashSet, in Java.
Solutions for other languages are also welcome.
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Why is try {…} finally {…} good; try {…} catch{} bad?
...urred. try..finally will run your cleanup code and then the exception will keep going, to be handled by something that knows what to do with it.
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How can I use a DLL file from Python?
...). This has been, by far, the easiest way I've found for doing what you ask.
import ctypes
# Load DLL into memory.
hllDll = ctypes.WinDLL ("c:\\PComm\\ehlapi32.dll")
# Set up prototype and parameters for the desired function call.
# HLLAPI
hllApiProto = ctypes.WINFUNCTYPE (
ctypes.c_int, ...
Support for “border-radius” in IE
Does anyone know if/when Internet Explorer will support the "border-radius" CSS attribute?
11 Answers
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Is it valid to define functions in JSON results?
...t data-interchange format." - not a programming language.
Per http://en.wikipedia.org/wiki/JSON, the "basic types" supported are:
Number (integer, real, or floating
point)
String (double-quoted Unicode
with backslash escaping)
Boolean
(true and false)
Array (an ordered
sequence of values, comma-...
cannot download, $GOPATH not set
...e it, etc.]
The official Go site discusses GOPATH and how to lay out a workspace directory.
export GOPATH="$HOME/your-workspace-dir/" -- run it in your shell, then add it to ~/.bashrc or equivalent so it will be set for you in the future. Go will install packages under src/, bin/, and pkg/, subdir...
All but last element of Ruby array
... # => [1, 2, 3, 4]
a.first a.size - 1 # => [1, 2, 3]
or
a.take 3
or
a.first 3
or
a.pop
which will return the last and leave the array with everything before it
or make the computer work for its dinner:
a.reverse.drop(1).reverse
or
class Array
def clip n=1
take size ...
Generate a random letter in Python
Is there a way to generate random letters in Python (like random.randint but for letters)? The range functionality of random.randint would be nice but having a generator that just outputs a random letter would be better than nothing.
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Calling remove in foreach loop in Java [duplicate]
...on. Thus, in the face of concurrent
modification, the iterator fails quickly and cleanly, rather than
risking arbitrary, non-deterministic behavior at an undetermined time
in the future.
Perhaps what is unclear to many novices is the fact that iterating over a list using the for/foreach cons...
Constant pointer vs Pointer to constant [duplicate]
I want to know the difference between
8 Answers
8
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