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When are you truly forced to use UUID as part of the design?
...sions:
Version 4 UUIDs are essentially just 16 bytes of randomness pulled from a cryptographically secure random number generator, with some bit-twiddling to identify the UUID version and variant. These are extremely unlikely to collide, but it could happen if a PRNG is used or if you just happen t...
Add context path to Spring Boot application
...tically. The reason for the context root is we want the app to be accessed from localhost:port/{app_name} and have all the controller paths append to it.
...
How to create hyperlink to call phone number on mobile devices?
...l include them.
Since we never know where our website visitors are coming from, we need to make phone numbers callable from anywhere in the world. For this reason the + sign is always necessary. The + sign is automatically converted by your mobile carrier to your international dialing prefix, also ...
Handling specific errors in JavaScript (think exceptions)
...
To create custom exceptions, you can inherit from the Error object:
function SpecificError () {
}
SpecificError.prototype = new Error();
// ...
try {
throw new SpecificError;
} catch (e) {
if (e instanceof SpecificError) {
// specific error
} else {
thr...
Can you build dynamic libraries for iOS and load them at runtime?
...u to open the library by passing in the path to that framework, or dylib. From some docs for building jailbreak apps, here's an example of calling an init() function implemented inside your own, separate dylib:
#include <dlfcn.h>
initWrapper() {
char *dylibPath = "/Applications/myapp.ap...
Backbone.js: `extend` undefined?
... I totally missed that dependency in the docs. Duh.
Further clarification from @tjorriemorrie:
I had underscore, but loaded in the wrong order, first load underscore (guess that is what 'dependency' means :)
Further Clarification just in case this isn't obvious. The order that things are loaded...
iphone/ipad: How exactly use NSAttributedString?
...es convenience methods for setting the attributes of an NSAttributedString from UIKit classes.
From the sample provided in the repo:
#import "NSAttributedString+Attributes.h"
#import "OHAttributedLabel.h"
/**(1)** Build the NSAttributedString *******/
NSMutableAttributedString* attrStr = [NSMutab...
isset() and empty() - what to use
...y array)
var $var; (a variable declared, but without a value in a class)
From http://php.net/manual/en/function.empty.php
As mentioned in the comments the lack of warning is also important with empty()
PHP Manual says
empty() is the opposite of (boolean) var, except that no warning is
ge...
iphone - how can i get the height and width of uiimage
From the URL Image in Mail
8 Answers
8
...
Why is processing a sorted array faster than processing an unsorted array?
...less.
Further reading: "Branch predictor" article on Wikipedia.
As hinted from above, the culprit is this if-statement:
if (data[c] >= 128)
sum += data[c];
Notice that the data is evenly distributed between 0 and 255. When the data is sorted, roughly the first half of the iterations will no...