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How can we prepend strings with StringBuilder?
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You could build the string in reverse and then reverse the result.
You incur an O(n) cost instead of an O(n^2) worst case cost.
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LEFT OUTER joins in Rails 3
... of both strings and named associations.
If the value is a
string, then the records will be returned read-only since they will
have attributes that do not correspond to the table‘s columns. Pass
:readonly => false to override.
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Options for HTML scraping? [closed]
... good option for PHP, if your familiar with jQuery or JavaScript selectors then you will find yourself at home.
Find it here
There is also a blog post about it here.
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Arguments or parameters? [duplicate]
...meter is set to the value of the argument 8, and denominator is set to 4. Then the function is evaluated with the parameters set to the value of the arguments. You can think of the process as equivalent to:
int divide() {
int numerator = 8;
int denominator = 4;
return numerator/denomi...
Check whether an array is empty [duplicate]
...r value set to true.
$set_errors = array_keys( $errors, true );
You can then use the empty() function to check whether this array is empty, simultaneously telling you whether there are errors and also which errors have occurred.
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Display block without 100% width
...ow">
<div class="cell">Content</div>
</div>
And then for the CSS:
.cell{display:inline-block}
It's hard to give you a solution without seeing your original code.
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jQuery .scrollTop(); + animation
...st I used an if statement to see if the top of the page was not set to 0. Then if it's not 0 I animate the page to scroll to the top.
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Visual Studio 2012 Express is suddenly “incompatible with this version of Windows”?
...pdate.
(I'm using Windows 8, installed all important updates for Windows, then tried repair Visual Studio in Programs and Features, problem still here until installed Update 2.)
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PHP page redirect [duplicate]
...: http://www.domain.com/user.php" );
But you can't first do an echo, and then redirect.
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How to get the element clicked (for the whole document)?
...following inside the body tag
<body onclick="theFunction(event)">
then use in javascript the following function to get the ID
<script>
function theFunction(e)
{ alert(e.target.id);}
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