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Why does int i = 1024 * 1024 * 1024 * 1024 compile without error?
...nt expression:
int i = 1024 * 1024 * 1024 * 1024;
becomes:
0: iconst_0
1: istore_1
Notice that the result (0) is simply loaded and stored, and no multiplication takes place.
From JLS §3.10.1 (thanks to @ChrisK for bringing it up in the comments):
It is a compile-time ...
Ruby: Easiest Way to Filter Hash Keys?
...with just the choices in it.
choices = params.select { |key, value| key.to_s.match(/^choice\d+/) }
or you can use delete_if and modify the existing Hash e.g.
params.delete_if { |key, value| !key.to_s.match(/choice\d+/) }
or if it is just the keys and not the values you want then you can do:
p...
Can you attach Amazon EBS to multiple instances?
...ble to get an EBS volume attached to more than one instance, it would be a _REALLY_BAD_IDEA_. To quote Kekoa, "this is like using a hard drive in two computers at once"
Why is this a bad idea? ...
The reason you can't attach a volume to more than one instance is that EBS provides a "block storage...
Why was the switch statement designed to need a break?
...ors
that can have either one or two
operands:
switch (operator->num_of_operands) {
case 2: process_operand( operator->operand_2);
/* FALLTHRU */
case 1: process_operand( operator->operand_1);
break;
}
Case fall through is so widely
recognized as a def...
What does passport.session() middleware do?
...r/lib/strategies/session.js
Specifically lines 59-60:
var property = req._passport.instance._userProperty || 'user';
req[property] = user;
Where it essentially acts as a middleware and alters the value of the 'user' property in the req object to contain the deserialized identity of the user. To ...
How to get Bitmap from an Uri?
...ActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK)
{
Uri imageUri = data.getData();
Bitmap bitmap = MediaStore.Images.Media.getBitmap(this.getContentResolver(), imageUri);
}
}
If you need to load very large images, the following code will load i...
Nullable Foreign Key bad practice?
...
source__destination_link or SourceDestination
– Svisstack
Jan 20 '12 at 23:33
7
...
How to fix HTTP 404 on Github Pages?
...
In my case, I had folders whose names started with _ (like _css and _js), which GH Pages ignores as per Jekyll processing rules. If you don't use Jekyll, the workaround is to place a file named .nojekyll in the root directory.
...
Java - No enclosing instance of type Foo is accessible
...nt where it is declared.
Let`s try to see the above concepts practically_
public class MyInnerClass {
public static void main(String args[]) throws InterruptedException {
// direct access to inner class method
new MyInnerClass.StaticInnerClass().staticInnerClassMethod();
// static ...
Convert a String representation of a Dictionary to a dictionary?
...
Starting in Python 2.6 you can use the built-in ast.literal_eval:
>>> import ast
>>> ast.literal_eval("{'muffin' : 'lolz', 'foo' : 'kitty'}")
{'muffin': 'lolz', 'foo': 'kitty'}
This is safer than using eval. As its own docs say:
>>> help(ast.literal_e...