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Seeking clarification on apparent contradictions regarding weakly typed languages
...Eric has said, consider the following C code:
void f(void* x);
f(42);
f("hello");
In contrast to languages such as Python, C#, Java or whatnot, the above is weakly typed because we lose type information. Eric correctly pointed out that in C# we can circumvent the compiler by casting, effectively...
Best way to test for a variable's existence in PHP; isset() is clearly broken
... I'll edit it down later...)
Consider the following code:
$test_value = 'hello';
foreach ( $list_of_things as $thing ) {
if ( some_test($thing, $test_value) ) {
$result = some_function($thing);
}
}
if ( isset($result) ) {
echo 'The test passed at least once!';
}
If some_funct...
How to convert a number to string and vice versa in C++
...you use it as;
string str = make_string() << 6 << 8 << "hello";
Quite nifty!
Also I use this function to convert strings to anything streamable, althrough its not very safe if you try to parse a string not containing a number;
(and its not as clever as the last one either)
//...
Getting started with Haskell
...this is where I'm at).
Expert
It will take you years to get to this stage (hello from 2009!), but from here I'm guessing you start writing phd papers, new ghc extensions, and coming up with new abstractions.
Getting Help
Finally, while at any stage of learning, there are multiple places for getting ...
What is a raw type and why shouldn't we use it?
...rom Object to the desired type.
List aList = new ArrayList();
String s = "Hello World!";
aList.add(s);
String c = (String)aList.get(0);
While this worked most of the time, errors did happen
List aNumberList = new ArrayList();
String one = "1";//Number one
aNumberList.add(one);
Integer iOne = (In...
What's the “big idea” behind compojure routes?
... library.
(use 'ring.util.response)
(defn handler [request]
(response "Hello World"))
Now we want to call different handlers depending on the request.
We could do some static routing like so :
(defn handler [request]
(or
(if (= (:uri request) "/a") (response "Alpha"))
(if (= (:uri r...
Java 256-bit AES Password-Based Encryption
...erSpec(IvParameterSpec.class).getIV();
byte[] ciphertext = cipher.doFinal("Hello, World!".getBytes("UTF-8"));
Store the ciphertext and the iv. On decryption, the SecretKey is regenerated in exactly the same way, using using the password with the same salt and iteration parameters. Initialize the c...
Simple way to encode a string according to a password?
...es) -> bytes:
return zlib.decompress(b64d(obscured))
This turns b'Hello world!' into b'eNrzSM3JyVcozy_KSVEEAB0JBF4='.
Integrity only
If all you need is a way to make sure that the data can be trusted to be unaltered after having been sent to an untrusted client and received back, then you...
Is Java really slow?
... developer writing the first few programs in the language. Execution of a "hello world" program in most languages appears instantaneous, but in Java there's an easily perceptible pause as the JVM starts up. Even a pure interpreter that runs much more slowly on tight loops and such will still often a...
Pretty-print C++ STL containers
...back(23);
i.push_back(34);
std::set<std::string> j;
j.insert("hello");
j.insert("world");
double k[] = { 1.1, 2.2, M_PI, -1.0/123.0 };
std::cout << i << "\n" << j << "\n" << k << "\n";
}
It currently only works with vector and set, but can b...