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Best way to detect when a user leaves a web page?
...ution - since in most browsers the navigation controls (the nav bar, tabs, etc.) are located above the page content area, you can detect the mouse pointer leaving the page via the top and display a "before you leave" dialog. It's completely unobtrusive and it allows you to interact with the user bef...
IPN vs PDT in Paypal
...t messages that you can receive from IPN, such as chargeback notification, etc, and thus you really should implement it.
PayPal's PDT system sends order confirmations to merchant sites that use PayPal Payments Standard and lets them authenticate this information. Such sites can then display this ...
Find the Smallest Integer Not in a List
...y understood without the bit twiddling: "Create a Boolean array of size N" etc. Once you understand it that way, moving to a bitwise version is conceptually easy.
– Jon Skeet
Oct 19 '09 at 5:27
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Build tree array from flat array in javascript
...ibrary. It's, as far as I can tell, the fastest solution.
function list_to_tree(list) {
var map = {}, node, roots = [], i;
for (i = 0; i < list.length; i += 1) {
map[list[i].id] = i; // initialize the map
list[i].children = []; // initialize the children
}
for (i = 0; i ...
'this' vs $scope in AngularJS controllers
...in play) are accessible from the HTML/view. E.g., from ng-click, filters, etc.
Long answer:
A controller function is a JavaScript constructor function. When the constructor function executes (e.g., when a view loads), this (i.e., the "function context") is set to the controller object. So in t...
How to tell where a header file is included from?
...
If you use -MM or one of the related options (-M, etc), you get just the list of headers that are included without having all the other preprocessor output (which you seem to get with the suggested g++ -E -dI solution).
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What does a tilde do when it precedes an expression?
...needed ++ and -- in a while because of primitive methods like map, forEach etc. My point is more about why they didn't also consider ~ excessively tricky when whatever standard used includes increment and decrement operators. To forbid something so CIS101 doesn't make any sense.
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Performance differences between debug and release builds
...ted by code that runs elsewhere. Reading a file, executing a dbase query, etc. Making the work the JIT optimizer does completely invisible. It doesn't mind though :)
The JIT optimizer is pretty reliable code, mostly because it has been put to the test millions of times. It is extremely rare to ...
Difference between doseq and for in Clojure
...ide-effects (printing, writing to a database, launching a nuclear warhead, etc) based on elements from some sequences, use doseq.
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How to control the line spacing in UILabel
...ue (instead of a ratio) common to design applications such as Photoshop, Sketch, CSS, etc.
– Albert Bori
Jan 24 '17 at 19:16
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