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How does Duff's device work?
... // Set to 20
{
int n = (count + 7) / 8; // n is now 3. (The "while" is going
// to be run three times.)
switch (count % 8) { // The remainder is 4 (20 modulo 8) so
// jump to th...
JavaScript by reference vs. by value [duplicate]
...false
Example 2:
var a = ["1", "2", {foo:"bar"}];
var b = a[1]; // b is now "2";
var c = a[2]; // c now references {foo:"bar"}
a[1] = "4"; // a is now ["1", "4", {foo:"bar"}]; b still has the value
// it had at the time of assignment
a[2] = "5"; // a is now ["1", "4", "5"]; c st...
What is this Javascript “require”?
...b browser with a limited global context defined mostly by what came to be known as the Document Object Model (DOM) level 0 (the Netscape Navigator Javascript API).
Server-side Javascript eliminates that restriction and allows Javascript to call into various pieces of native code (like the Postgres ...
How to get duration, as int milli's and float seconds from ?
...;
typedef std::chrono::duration<float> fsec;
auto t0 = Time::now();
auto t1 = Time::now();
fsec fs = t1 - t0;
ms d = std::chrono::duration_cast<ms>(fs);
std::cout << fs.count() << "s\n";
std::cout << d.count() << "ms\n";
}
which for m...
How can I check for “undefined” in JavaScript? [duplicate]
...n window; // true
"theFoo" in window; // false
If you are interested in knowing whether the variable hasn't been declared or has the value undefined, then use the typeof operator, which is guaranteed to return a string:
if (typeof myVar !== 'undefined')
Direct comparisons against undefined are ...
iOS UIImagePickerController result image orientation after upload
...ft:
case UIImageOrientationRight:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, self.size.width, self.size.height,
...
How does JavaScript .prototype work?
... really got my head around this prototype-based programming, does any one know how this works?
26 Answers
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Java SE 6 vs. JRE 1.6 vs. JDK 1.6 - What do these mean?
...you are seeing is the HotSpot version.
Update: HotSpot is (or used to be, now they seem to use it to mean the whole VM) the just-in-time compiler that is built in to the Java Virtual Machine. God only knows why Sun gives it a separate version number.
...
How can I add new keys to a dictionary?
... value is in the end too. Anyway answer has been edited and is much better now. Updating with a dictionary is good when it's likely that it contains many items.
– Jean-François Fabre♦
Jan 20 at 16:26
...
PHP Pass by reference in foreach [duplicate]
... the output I was able to understand: $v gets the item [0](zero). $a[3] is now zero $v gets the item [1](one). $a[3] is now one $v gets the item [2](two). $a[3] is now two $v gets the item [3](two). $a[3] is now two
– Eduardo
Sep 2 '13 at 2:18
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