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How do I print the type or class of a variable in Swift?
...lf and any instance using .dynamicType:
struct Box<T> {}
toString("foo".dynamicType) // Swift.String
toString([1, 23, 456].dynamicType) // Swift.Array<Swift.Int>
toString((7 as NSNumber).dynamicType) // __NSCFNumber
toString((Bool?).self) // Swift.Optio...
Can a local variable's memory be accessed outside its scope?
...said that if you leave stuff behind, they'll shred it for you. If you illegally re-enter your room with a stolen key to get it back, the hotel security staff is not required to catch you sneaking in. You didn't make a contract with them that said "if I try to sneak back into my room later, you are r...
Add a CSS class to
...ed/displayed, such as @person, it will name the button accordingly (Update Foo or Create Foo) and also the form_for FormBuilder chooses the correct action. So this way you can extract the form code into a partial and use it to display the model object (if you wish to use a form to display it), updat...
Mongoose and multiple database in single node.js project
... thing you can do is, you might have subfolders for each projects. So, install mongoose in that subfolders and require() mongoose from own folders in each sub applications. Not from the project root or from global. So one sub project, one mongoose installation and one mongoose instance.
-app_root/
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Replace only some groups with Regex
...u can also use non capturing groups - good for groups you don't use. In (?:foo)(bar), $1 will replace bar. more details
– Patrick
May 28 '18 at 20:21
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Ruby on Rails: how do I sort with two columns using ActiveRecord?
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Assuming you're using MySQL,
Model.all(:order => 'DATE(updated_at), price')
Note the distinction from the other answers. The updated_at column will be a full timestamp, so if you want to sort based on the day it was updated, you need to use a function to ...
How do I convert a NSString into a std::string?
...ou don't want non-ASCII characters in there, you can use dataUsingEncoding:allowLossyConversion: to get an NSData representation of the string with lossy encoded ASCII content, and then throw that at your std::string
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How can I check if a program exists from a Bash script?
...type or command are way cheaper), you can also rely on the builtins to actually do what you want, while the effects of external commands can easily vary from system to system.
Why care?
Many operating systems have a which that doesn't even set an exit status, meaning the if which foo won't even wor...
Why can I use auto on a private type?
...e itself is still usable, which is why you can return it to client code at all.
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Why can't we have static method in a (non-static) inner class?
... would be 'annoying as a mothertrucker'. Don't understand why Java doesn't allow for this. Sometimes, I want an inner class to use properties of the parent class, but keep static methods for better namespacing. Is there something inherently wrong with this? :(
– Angad
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