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Getting an object from an NSSet
...se filteredSetUsingPredicate if you have some kind of unique identifier to select the object you need.
First create the predicate (assuming your unique id in the object is called "identifier" and it is an NSString):
NSPredicate *myPredicate = [NSPredicate predicateWithFormat:@"identifier == %@", i...
MySQL ON DUPLICATE KEY - last insert id?
...LAST_INSERT_ID(3000)) ON DUPLICATE KEY UPDATE id = LAST_INSERT_ID(id + 1);
SELECT LAST_INSERT_ID();
If the prefix exists, it will increment it and populate last_insert_id.
If the prefix does not exist, it will insert the prefix with the value 3000 and populate last_insert_id with 3000.
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How to URL encode a string in Ruby
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@J-Rou, CGI.escape can escape whole URL, it does not selectively escapes query parameters, for instance, if you pass 'a=&!@&b=&$^' to CGI.escape it will escape whole thing with query separators & so this could be used only to query values. I suggest using addres...
How to update npm
...all n module of npm:
sudo npm install -g n
3) Begin the installation by selecting the version of node to install: stable or latest, we will use stable here:
sudo n stable
4) Check the version of node:
node -v
5) Check the version of npm:
npm -v
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IndentationError: unindent does not match any outer indentation level
...DLE editor you can do as it suggests in one of similar error messages:
1) select all, e.g. Ctrl + A
2) Go to Format -> Untabify Region
3) Double check your indenting is still correct, save and rerun your program.
I'm using Python 2.5.4
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Rails Migration: Remove constraint
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This should be the selected answer
– nahtnam
Aug 9 '19 at 17:50
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How to reset radiobuttons in jQuery so that none is checked
...is empty, it means give me the value of the first element that matches the selector.
– lambacck
Jul 21 '10 at 0:55
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Set UILabel line spacing
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However in Xcode 6.1.1 selecting the label and changing the line value in the attributed panel will cause the panel to flicker and lock the application. I have only been able to exit the panel by force-quitting Xcode.
– izk
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Hash String via SHA-256 in Java
...hich adds quite a few new MessageDigests compared to the relatively paltry selection available in the JDK.
– mjuarez
Jul 27 '14 at 9:51
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How to generate all permutations of a list?
....permutations([1,2,3], r=2), which will generate all possible permutations selecting 2 elements: [(1, 2), (1, 3), (2, 1), (2, 3), (3, 1), (3, 2)]
– toto_tico
Aug 24 '17 at 8:49
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