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design a stack such that getMinimum( ) should be O(1)
...robably more efficient than two stacks of the same size (fewer overheads - arrays, list nodes etc) although it will depend on language.
– Jon Skeet
Mar 26 '09 at 10:30
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Is there an “exists” function for jQuery?
... could also use the following. If there are no values in the jQuery object array then getting the first item in the array would return undefined.
if ( $('#myDiv')[0] ) { /* Do something */ }
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Add leading zeroes to number in Java? [duplicate]
...digits > 0 : "Invalid number of digits";
// create variable length array of zeros
char[] zeros = new char[digits];
Arrays.fill(zeros, '0');
// format number as String
DecimalFormat df = new DecimalFormat(String.valueOf(zeros));
return df.format(num);
}
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ActiveRecord OR query
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If you want to use an OR operator on one column's value, you can pass an array to .where and ActiveRecord will use IN(value,other_value):
Model.where(:column => ["value", "other_value"]
outputs:
SELECT `table_name`.* FROM `table_name` WHERE `table_name`.`column` IN ('value', 'other_value')
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JavaScript - Getting HTML form values
.../form-serialize/)
serialize(document.forms[0]);
jQuery
$("form").serializeArray()
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How can I split a JavaScript string by white space or comma?
...ural sentences sooner or later you'll end up getting empty elements in the array. e.g. ['foo', '', 'bar'].
Which is fine if that's okay for your use case. But if you want to get rid of the empty elements you can do:
var str = 'whatever your text is...';
str.split(/[ ,]+/).filter(Boolean);
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sudo echo “something” >> /etc/privilegedFile doesn't work
...in/ipfw</string>
<key>ProgramArguments</key>
<array>
<string>/sbin/ipfw</string>
<string>-q</string>
<string>/etc/ipfw.conf</string>
</array>
<key>RunAtLoad</key>
<true></true...
“Invalid JSON primitive” in Ajax processing
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As noted by jitter, the $.ajax function serializes any object/array used as the data parameter into a url-encoded format. Oddly enough, the dataType parameter only applies to the response from the server - and not to any data in the request.
After encountering the same problem I downl...
How to concatenate two strings in C++?
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If you were programming in C, then assuming name really is a fixed-length array like you say, you have to do something like the following:
char filename[sizeof(name) + 4];
strcpy (filename, name) ;
strcat (filename, ".txt") ;
FILE* fp = fopen (filename,...
You see now why everybody recommends st...
Get Substring - everything before certain char
... And if you have more than one hyphen, you get multiple elements in your array.
– James Dunne
Nov 12 '12 at 15:48
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