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What does $$ mean in the shell?
... use a double dollar sign ( $$ ). This does produce a number that varies from time to time... but if you call it repeatedly, it returns the same number. (The solution is to just use the time.)
...
How to change the text of a button in jQuery?
... wrapped it in a .click() call, of course
EDIT 2 : Newer jQuery versions (from > 1.6) use .prop rather than .attr
EDIT 3 : If you're using jQuery UI, you need to use DaveUK's method (below) of adjusting the text property
...
Print “hello world” every X seconds
...c void run() {
System.out.println("Hello World!");
}
}
// And From your main() method or any other method
Timer timer = new Timer();
timer.schedule(new SayHello(), 0, 5000);
share
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im...
Can a foreign key be NULL and/or duplicate?
...do is allow nulls on the field that has the FK. The null value is separate from the idea of it being an FK.
Whether it is unique or not unique relates to whether the table has a one-one or a one-many relationship to the parent table. Now if you have a one-one relationship, it is possible that you...
IIS: Idle Timeout vs Recycle
...
Idle Timeout is if no action has been asked from your web app, it the process will drop and release everything from memory
Recycle is a forced action on the application where your processed is closed and started again, for memory leaking purposes and system health
Th...
Reference: Comparing PHP's print and echo
...non-zero values (positive and negative) are truthy values and this derives from PHP's Perl legacy.
But, if this is the case, then one may wonder why echo take multiple arguments whereas print can only handle one. For this answer we need to turn to the parser, specifically the file zend_language_...
How to programmatically send a 404 response with Express/Node?
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@UpTheCreek, I'll remove the first example from the code to avoid the potential for that confusion.
– Drew Noakes
Oct 15 '14 at 13:10
1
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Are arrays in PHP copied as value or as reference to new variables, and when passed to functions?
... unnecessary copy).
function handle_array($my_array) {
// ... read from but do not modify $my_array
print_r($my_array);
// ... $my_array effectively passed by reference since no copy is made
}
However if you modify the array, a copy of it is made first (which uses more memory but ...
range() for floats
...esented are based on iterating over integers and deriving the final floats from the integers. This is more robust. If you do it directly with floats, you risk having strange one-off errors due to how floats are represented internally. For instance, if you try list(frange(0, 1, 0.5)), it works fine a...
Choosing between MEF and MAF (System.AddIn)
...application. It also provides a very complete way of decoupling the addons from depending on anything but the contract you give them. In fact, you can versionize your contract adapters to provide backwards compatibility to old addons while you are upgrading the main App. While this sounds great, i...