Tarik 1. Using default implementations (preferred). protocol MyProtocol { func doSomething() } extension MyProtocol { func doSomething() { /* return a default value or just leave empty */ } } struct MyStruct: MyProtocol { /* no compile error */ } Advantages No Objective-C runtime is involved (well, no explicitly at least). This means you can conform … Read more
This works in IE9 and above and all other browsers. document.querySelector(‘input[name=”rate”]:checked’).value;
If you like ascii art: “VALID” = without padding: inputs: 1 2 3 4 5 6 7 8 9 10 11 (12 13) |________________| dropped |_________________| “SAME” = with zero padding: pad| |pad inputs: 0 |1 2 3 4 5 6 7 8 9 10 11 12 13|0 0 |________________| |_________________| |________________| In this example: … Read more
The Haskell approach seems to be to just wrap imperative GUI toolkits (such as GTK+ or wxWidgets) and to use “do” blocks to simulate an imperative style That’s not really the “Haskell approach” — that’s just how you bind to imperative GUI toolkits most directly — via an imperative interface. Haskell just happens to have … Read more
When dialing a number within the country you are in, you still need to dial the national trunk number before the rest of the number. For example, in Australia one would dial: 0 – trunk prefix 2 – Area code for New South Wales 6555 – STD code for a specific telephone exchange 1234 – … Read more
Thread is a lower-level concept: if you’re directly starting a thread, you know it will be a separate thread, rather than executing on the thread pool etc. Task is more than just an abstraction of “where to run some code” though – it’s really just “the promise of a result in the future”. So as … Read more
This happened to me when I was being lazy and included a script tag as part of the content that was being returned. As such: Partial HTML Content: <div> SOME CONTENT HERE </div> <script src=”https://stackoverflow.com/scripts/script.js”></script> It appears, at least in my case, that if you return HTML content like that via xhr, you will cause … Read more
try if ! grep -q sysa /etc/passwd ; then grep returns true if it finds the search target, and false if it doesn’t. So NOT false (! false) == true. if evaluation in shells are designed to be very flexible, and many times doesn’t require chains of commands (as you have written). Also, looking at … Read more
Adding a pull request to an existing upstream issue is easy assuming you forked using the normal github means. Simply reference the issue in your commit message using any of the supported keywords: close closes closed fix fixes fixed resolve resolves resolved For example: “this commit fixes #116” The text referencing the issue does not … Read more
The CORS spec is all-or-nothing. It only supports *, null or the exact protocol + domain + port: http://www.w3.org/TR/cors/#access-control-allow-origin-response-header Your server will need to validate the origin header using the regex, and then you can echo the origin value in the Access-Control-Allow-Origin response header.