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Why is the String class declared final in Java?
...ople making the point about immutability were unclear in exactly what they meant, but their statements are correct when understood in context.
– Jay
Jan 28 '11 at 21:20
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Index on multiple columns in Ruby on Rails
...ning at the same time, the validation is subject to race conditions, which means it might fail to detect duplicates in some cases (eg. submit twice the same form at the exact same time).
share
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imp...
Show/hide 'div' using JavaScript
... probably just be toggling between display: none and display: block, which means that the following may be sufficient when showing a collection of elements.
You can optionally specify the desired display as the second argument if you don't want it to default to block.
function show (elements, spec...
What does __FILE__ mean in Ruby?
...t is created and stored (but never updated) when your file is loaded. This means that if you have any calls to Dir.chdir anywhere else in your application, this path will expand incorrectly.
puts __FILE__
Dir.chdir '../../'
puts __FILE__
One workaround to this problem is to store the expanded val...
What does Class mean in Java?
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It means your Class reference can hold a reference to any Class object.
It's basically the same as "Class" but you're showing other people who read your code that you didn't forget about generics, you just want a reference that...
How to select an element by classname using jqLite?
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angualr uses the lighter version of jquery called as jqlite which means it doesnt have all the features of jQuery. here is a reference in angularjs docs about what you can use from jquery.
Angular Element docs
In your case you need to find a div with ID or class name.
for class name you ...
Where should I put tags in HTML markup?
...referencing an external script file.
The browser requests the script file. Meanwhile, the parser blocks and stops parsing the other HTML on your page.
After some time the script is downloaded and subsequently executed.
The parser continues parsing the rest of the HTML document.
Step #4 causes a ba...
Error in : object of type 'closure' is not subsettable
...
In general this error message means that you have tried to use indexing on a function. You can reproduce this error message with, for example
mean[1]
## Error in mean[1] : object of type 'closure' is not subsettable
mean[[1]]
## Error in mean[[1]] : obj...
What does f+++++++++ mean in rsync logs?
...es again, that it had already transferred, if they were not changed in the meantime. But it will start checking all the files again from the beginning to find out, as it is not aware that it had been interrupted.
2 - Each character is a code that can be translated if you read the section for -i, --...
Unsafe JavaScript attempt to access frame with URL
...h property, but you are allowed to set the location property itself.
This means that given that the top windows location is http://example.com/page/, instead of doing
parent.location.hash = "#foobar";
you do need to know the parents location and do
parent.location = "http://example.com/page/#fo...