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Array versus linked-list
...t, i.e. that data structure that allows duplicate elements in an arbitrary order, that’s not suitable and you would have to go great lengths to make a data structure like LinkedList a concurrently updatable thing. If you only need a concurrent queue or deque, well yes, there are even existing exam...
Disable/enable an input with jQuery?
... to disable ALL form input controls - incl. checkboxes, radios, textareas, etc. - you have to select ':input', not just 'input'. The latter selects only actual <input> elements.
– Cornel Masson
Aug 16 '12 at 8:10
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Using ECMAScript 6
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Ajax, back button and DOM updates
... to the page that they've seen last with all DOM updates, javascript state etc. developers shouldn't break this by doing something in unload event and if they do, webbrowsers shouldn't try to fix the problem by not using bfcache at all. whole unload event is one big joke. I'm sure 99% of time it's u...
How do I check if an index exists on a table field in MySQL?
...re a.table_schema = 'your_schema'
and a.column_name = 'your_column'
order by a.table_schema, a.table_name;
since the joins are against INNODB_SYS_*, so the match indexes only came from INNODB tables only
share
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How to initialize static variables
... "type_a"=>"Type A",
"type_b"=>"Type B",
//... etc.
);
}
}
Wherever you need the list, simply call the getter method. For example:
if (array_key_exists($type, MyClass::getTypeList()) {
// do something important...
}
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How to stop an animation (cancel() does not work)
... which are used to create interactive UI components (buttons, text fields, etc.).
/**
* Sets the next animation to play for this view.
* If you want the animation to play immediately, use
* {@link #startAnimation(android.view.animation.Animation)} instead.
* This method provides ...
What does the comma operator , do?
...ressions either side of it into one, evaluating them both in left-to-right order. The value of the right-hand side is returned as the value of the whole expression.
(expr1, expr2) is like { expr1; expr2; } but you can use the result of expr2 in a function call or assignment.
It is often seen in f...
Bytes of a string in Java
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@KorayTugay Yes, more or less. You could argue about the order of cause and effect, though. I'd be more inclined to state that a char is always 2 bytes because it is a primitive data type defined to be 2 bytes wide. (And that the UTF-16 representation was mainly a consequence of ...
Does Android support near real time push notification?
...but data driven, almost immediate message delivery, scalable, not polling, etc.)
I have a blog post with background information on this in case it's helpful http://dalelane.co.uk/blog/?p=938
(Note: MQTT is an IBM technology, and I should point out that I work for IBM.)
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