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How to get the original value of an attribute in Rails
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ActiveRecord's attributes_before_type_cast method returns a hash of attributes before typecasting and deserialization have occurred.
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How can I validate a string to only allow alphanumeric characters in it?
...an get fancier and implement all of the equality operators, or an explicit cast to AlphaNumericString from plain ol' string, if you care.
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How to configure heroku application DNS to Godaddy Domain?
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I used this videocast to set up my GoDaddy domain with Heroku, and it worked perfectly. Very clear and well explained.
Note: Skip the part about CNAME yourdomain.com. (note the .) and the heroku addons:add "custom domains"
http://blog.herok...
String strip() for JavaScript? [duplicate]
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to be compatible with the ECMA spec, trim() has to cast this to type string, ie you'll have to change this.replace(...) to String(this).replace(...) or ('' + this).replace(...); this allows to call() or apply() the function to non-string values
– Christo...
Can I add extension methods to an existing static class?
...configuration file? Normally I simply have ConfigurationSectionHandler and cast the output from ConfigurationManager to the appropriate class and don't bother with the wrapper.
– tvanfosson
Oct 8 '10 at 18:29
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How do I convert a NSString into a std::string?
...hiljordan.eu it could also be that the NSString is nil. In such a case the cast should be done like this:
// NOTE: if foo is nil this will produce an empty C++ string
// instead of dereferencing the NULL pointer from UTF8String.
This would lead you to such a conversion:
NSString *foo = @"Foo";
std...
What does |= (single pipe equal) and &=(single ampersand equal) mean
... for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the non-compound operators, & is a bitwise "AND" and | is a bitwise "OR".
EDIT: In this case you want Folder.Attribu...
Rails detect if request was AJAX
...context, you have to treat them not as not booleans, but ones that will be cast to bool. Above env['HTTP_X_REQUESTED_WITH'] =~ /XMLHttpRequest/ returns 0 not false. And 0 is actually truthy, not falsey in ruby: 0 || 1 => 0 But I'm going to alter my post for clarity.
– pixele...
How to write iOS app purely in C
... it's fill color to white so that we clear the background.
// Note the cast to (CGFloat []). Otherwise, this would give a warning
// saying "invalid cast from type 'int' to 'CGFloat *', or
// 'extra elements in initializer'. Also note the assumption of RGBA.
// If this wasn't a dem...
How do I convert an array object to a string in PowerShell?
...r $ofs)
# This Is a cat
"$a"
# This-Is-a-cat
$ofs = '-' # after this all casts work this way until $ofs changes!
"$a"
Using operator join
# This-Is-a-cat
$a -join '-'
# ThisIsacat
-join $a
Using conversion to [string]
# This Is a cat
[string]$a
# This-Is-a-cat
$ofs = '-'
[string]$a
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