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How to create the most compact mapping n → isprime(n) up to a limit N?
...the primality test.
There isn't really a data structure for you to query. If you have lots of numbers to test, you should probably run a probabilistic test since those are faster, and then follow it up with a deterministic test to make sure the number is prime.
You should know that the math behind...
what is reverse() in Django
...rendered as:
<a href="/foo/">link which calls some_view</a>
Now say you want to do something similar in your views.py - e.g. you are handling some other url (not /foo/) in some other view (not some_view) and you want to redirect the user to /foo/ (often the case on successful form sub...
Outputting data from unit test in python
If I'm writing unit tests in python (using the unittest module), is it possible to output data from a failed test, so I can examine it to help deduce what caused the error? I am aware of the ability to create a customized message, which can carry some information, but sometimes you might deal with m...
How to bind a List to a ComboBox?
...mber_CountryCombo
Box.ValueMember = "Name";
This is the code I am using now.
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How to trigger a file download when clicking an HTML button or JavaScript
This is crazy but I don't know how to do this, and because of how common the words are, it's hard to find what I need on search engines. I'm thinking this should be an easy one to answer.
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How can you encode a string to Base64 in JavaScript?
...) accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to do something...
Mechanisms for tracking DB schema changes [closed]
...t migrations and have implemented their own language-specific versions. I know of Ruckusing, a PHP migrations system that is modelled after Rails' migrations; it might be what you're looking for.
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Call UrlHelper in models in ASP.NET MVC
...t's not working for me. Just for the record this is the solution I'm using now:
var httpContext = HttpContext.Current;
if (httpContext == null) {
var request = new HttpRequest("/", "http://example.com", "");
var response = new HttpResponse(new StringWriter());
httpContext = new HttpContext(r...
Get keys from HashMap in Java
...
This is doable, at least in theory, if you know the index:
System.out.println(team1.keySet().toArray()[0]);
keySet() returns a set, so you convert the set to an array.
The problem, of course, is that a set doesn't promise to keep your order. If you only have one...
Conditional HTML Attributes using Razor MVC3
...<script>$.post('changepassword.php?password=123')</script> and now any other user who views this page has their password instantly changed to a password that the malicious user knows.
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