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Optimistic vs. Pessimistic locking
...up through the TxID. This is how distributed transactions using two-phase commit protocols (such as XA or COM+ Transactions) work.
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How to merge dictionaries of dictionaries?
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What is this Javascript “require”?
...pository service that hosts published JavaScript modules. npm install is a command that lets you download packages from their repository.
Where did it put it, and how does Javascript find it?
The npm cli puts all the downloaded modules in a node_modules directory where you ran npm install. No...
Best way to allow plugins for a PHP application
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You could use an Observer pattern. A simple functional way to accomplish this:
<?php
/** Plugin system **/
$listeners = array();
/* Create an entry point for plugins */
function hook() {
global $listeners;
$num_args = func_num_args();
$args = func_get_args();
if($...
What techniques can be used to define a class in JavaScript, and what are their trade-offs?
.../ alerts "Howdy, my name is Bob"
Now the real answer is a whole lot more complex than that. For instance, there is no such thing as classes in JavaScript. JavaScript uses a prototype-based inheritance scheme.
In addition, there are numerous popular JavaScript libraries that have their own style...
What can MATLAB do that R cannot do? [closed]
I often hear people complain how expensive MATLAB licenses are. Then I wonder why they don't just use Octave or R . But is the latter right? Can you use R to replace MATLAB?
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Get last n lines of a file, similar to tail
...d version of the code above and came up with this recipe: code.activestate.com/recipes/577968-log-watcher-tail-f-log
– Giampaolo Rodolà
Nov 29 '11 at 19:32
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Why is enum class preferred over plain enum?
I heard a few people recommending to use enum classes in C++ because of their type safety .
9 Answers
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How to use double or single brackets, parentheses, curly braces
...ired for (most/all?) array references on the right hand side.
ephemient's comment reminded me that parentheses are also used for subshells. And that they are used to create arrays.
array=(1 2 3)
echo ${array[1]}
2
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Generating Random Passwords
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AFAIK this method does not generate a password complying to a password policy on the domain so it's not suitable for every usage.
– teebot
Apr 14 '10 at 14:05
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