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How to check if a Ruby object is a Boolean
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138
Simplest way I can think of:
# checking whether foo is a boolean
!!foo == foo
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What is the maximum length of a valid email address?
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1237
An email address must not exceed 254 characters.
This was accepted by the IETF following sub...
Notepad++ - How can I replace blank lines [duplicate]
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188
Press Ctrl+H (Replace)
Select Extended from SearchMode
Put \r\n\r\n in Find What
Put \r\n in ...
How do I check whether a jQuery element is in the DOM?
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11 Answers
11
Active
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Calculating text width
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142
This worked better for me:
$.fn.textWidth = function(){
var html_org = $(this).html();
va...
How do I get git to default to ssh and not https for new repositories
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311
Set up a repository's origin branch to be SSH
The GitHub repository setup page is just a sugge...
Difference between Python datetime vs time modules
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104
the time module is principally for working with unix time stamps; expressed as a floating poin...
IntelliJ inspection gives “Cannot resolve symbol” but still compiles code
Platform: IntelliJ Community Edition 10.0.3
SDK: jdk1.6.0_21
OS: Windows 7
51 Answers
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Do I need to manually close an ifstream?
...end of a function you can always use a nested scope.
In the standard (27.8.1.5 Class template basic_ifstream), ifstream is to be implemented with a basic_filebuf member holding the actual file handle. It is held as a member so that when an ifstream object destructs, it also calls the destructor on ...
Return 0 if field is null in MySQL
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Use IFNULL:
IFNULL(expr1, 0)
From the documentation:
If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2. IFNULL() returns a numeric or string value, depending on the context in which it is used.
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