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JavaScript OR (||) variable assignment explanation
... cannot later do if( true == f ). If an integer was stored in f, then this test will always return false.
– user1115652
Aug 1 '13 at 2:11
9
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boost::flat_map and its performance compared to map and unordered_map
...dering of instructions.
3) parameters
The last problem is people usually test for too few variations of the scenario.
A container performance is affected by:
Allocator
size of contained type
cost of implementation of copy operation, assignment operation, move operation, construction operation, o...
Objective-C: Property / instance variable in category
...gt;
static void *MyClassResultKey;
@implementation MyClass
- (NSString *)test {
NSString *result = objc_getAssociatedObject(self, &MyClassResultKey);
if (result == nil) {
// do a lot of stuff
result = ...;
objc_setAssociatedObject(self, &MyClassResultKey, result, OBJC_ASSOC...
JavaScript Regular Expression Email Validation [duplicate]
...attern =/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
return pattern.test(str); // returns a boolean
}
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What is a sensible way to layout a Go project [closed]
...uth/
oauth.go # package source
oauth_test.go # test source
Update July 2014: see "Structuring Applications in Go" from Ben Johnson
That article include tips like:
Separate your binary from your application
combining the main.go file and my app...
WebKit issues with event.layerX and event.layerY
I just noticed that I get tons of deprecated warnings in the latest (canary) build of Chrome.
9 Answers
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How to assign the output of a Bash command to a variable? [duplicate]
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In shell you assign to a variable without the dollar-sign:
TEST=`pwd`
echo $TEST
that's better (and can be nested) but is not as portable as the backtics:
TEST=$(pwd)
echo $TEST
Always remember: the dollar-sign is only used when reading a variable.
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Can I set an opacity only to the background image of a div?
...
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See test case on jsFiddle
:before and ::before pseudo-element
Another trick is to use the CSS 2.1 :before or CSS 3 ::before pseudo-elements. :...
How to remove leading zeros from alphanumeric text?
...$) negative lookahead ensures that not the entire string will be matched.
Test harness:
String[] in = {
"01234", // "[1234]"
"0001234a", // "[1234a]"
"101234", // "[101234]"
"000002829839", // "[2829839]"
"0", // "[0]"
"0000000", // "[...
Java NIO FileChannel versus FileOutputstream performance / usefulness
...s comparing these two methods. Here is the code I used, the file that I am testing with is around 350MB . Is it a good option to use NIO based classes for File I/O, if I am not looking at random access or other such advanced features?
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