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Select elements by attribute in CSS
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BoltClock♦BoltClock
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How do you return from 'gf' in Vim
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jopjop
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How to prove that a problem is NP complete?
...is NP complete, you need to:
Show it is in NP
In other words, given some information C, you can create a polynomial time algorithm V that will verify for every possible input X whether X is in your domain or not.
Example
Prove that the problem of vertex covers (that is, for some graph G, does it hav...
Use of the MANIFEST.MF file in Java
...separated from its value by a colon. The default manifest shows that it conforms to version 1.0 of the manifest specification.
The manifest can also contain information about the other files that are packaged in the archive. Exactly what file information is recorded in the manifest will depend on th...
How to encrypt/decrypt data in php?
...name, $auth_key, true);
if (hash_equals($auth, $actual_auth)) {
// perform decryption
}
See also: hash_equals()
Hashing
Storing a reversible password in your database must be avoided as much as possible; you only wish to verify the password rather than knowing its contents. If a user loses ...
Coffeescript — How to create a self-initiating anonymous function?
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As of CoffeeScript 1.3.1 (released April 2012), do also lets you pass arguments to the function. To pass 1 and 2 as the parameters x and y, write do (x = 1, y = 2) ->. (The documentation for this feature has gotten lost, but the issue where the feature was introdu...
Remove file extension from a file name string
...s file path
– lemon
Oct 2 '15 at 22:01
8
This is a better answer as it preserves the path
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What is two way binding?
...t two-way binding: while not a core feature of the framework, it can be performed quite simply using Backbone's Events though. It costs a few explicit lines of code for the simple cases; and can become quite hazardous for more complex bindings. Here is a simple case (untested code, written on the fl...
Best practices for exception management in Java or C# [closed]
... do something based on it. Or if I want to provide additional contextual information in an exception.
I use a general try catch at the application entry point, or the highest level possible. If an exception gets here I just log it and let it fail. Ideally exceptions should never get here.
I find ...
Pass arguments to Constructor in VBA
...claredId have a "global instance" that you get for free - exactly like UserForm modules (export a user form, you'll see its predeclaredId attribute is set to true).
A lot of people just happily use the predeclared instance to store state. That's wrong - it's like storing instance state in a static ...