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What do the plus and minus signs mean in Objective-C next to a method?
...in Objective C is like this:
NSNumber *myNumber = [NSNumber numberWithInt:123];
which is calling the 'numberWithInt' class method of the NSNumber class, which is a 'factory' method (i.e. a method that provides you with a 'ready made instance' of an object).
Objective C also allows the creation o...
Select by partial string from a pandas DataFrame
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df[df['value'].astype(str).str.contains('1234.+')] for filtering out non-string-type columns.
– François Leblanc
Feb 13 '18 at 20:22
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How do you clear a slice in Go?
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123
It all depends on what is your definition of 'clear'. One of the valid ones certainly is:
sli...
How can I extract embedded fonts from a PDF as valid font files?
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I have extracted fonts using this site and copied it at ~/.fonts, and the copy and paste was working!
– Eduardo Santana
Feb 29 '16 at 18:48
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Abusing the algebra of algebraic data types - why does this work?
...jections fst : A×B → A and snd : A×B → B, where given any type C and functions f : C → A, g : C → B you can define the pairing f &&& g : C → A×B such that fst ∘ (f &&& g) = f and likewise for g. Parametricity guarantees the universal properties automatically an...
PUT vs. POST in REST
... collection.
Examples:
<-- generic -- specific -->
URI: website.com/users/john
website.com - whole site
users - collection of users
john - item of the collection, or a resource
URI:website.com/users/john/posts/23
website.com - whole site
users - collection of...
Extract elements of list at odd positions
...it be enumerate(L) instead of enumerate(items) ?
– ab123
May 24 '18 at 5:38
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Error handling in Bash
...ore on Github: github.com/Privex/shell-core
– Someguy123
Oct 8 '19 at 4:39
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Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
...AS j USING(userid)
JOIN useraccounts AS us USING(userid)
WHERE j.jobid = 123
This is completely ambiguous. I put a UserID column in both Companies and user tables and there's no complaint. What if the UserID column in companies is the ID of the last person to modify that row?
I'm serious, Can ...
Transitioning from Windows Forms to WPF
...lers that hide or resize, or what ever about UI,
It makes UI development fun. Especially once you find out how it likes to play along with Asyc processes. It really takes away a lot of the headaches that were caused by Winforms.
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