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Best way to remove from NSMutableArray while iterating?
...re more than once in an array. As an alternative you could use an NSMutableIndexSet and -(void)removeObjectsAtIndexes.
– Georg Schölly
Jun 19 '09 at 20:47
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Git undo changes in some files [duplicate]
...th the changes to the file A. If you have not yet added the changes to the index or committed them, then you just want to use the checkout command - this will change the state of the working copy to match the repository:
git checkout A
If you added it to the index already, use reset:
git reset A...
Explain which gitignore rule is ignoring my file
...anism does not take effect on paths that are already tracked.
With "--no-index" option, it can be used to diagnose which paths that should have been ignored have been mistakenly added to the index.
See commit 8231fa6 from https://github.com/flashydave:
check-ignore currently shows how .gitig...
angular ng-repeat in reverse
..."alert in alerts.slice().reverse()" type="alert.type" close="alerts.splice(index, 1)">{{$index + 1}}: {{alert.msg}}</alert>
Update:
My answer was OK for old version of Angular.
Now, you should be using
ng-repeat="friend in friends | orderBy:'-'"
or
ng-repeat="friend in friends | ord...
Why unsigned integer is not available in PostgreSQL?
...signed as a first class type. In a table with 20 million records, with and indexed field like this, you are wasting 40MB of space on unused bits. If you are abusing that across another 20 tables, you're now wasting 800MB of space.
– tpartee
Mar 18 at 21:56
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How do you implement a good profanity filter?
...user input, search queries, and situations where the input text can potentially contain profanity or undesirable language. Oftentimes this needs to be filtered out.
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Extracting numbers from vectors of strings
..." years old", "", years))
or
# split by space, get the element in first index
as.numeric(sapply(strsplit(years, " "), "[[", 1))
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how to get the last character of a string?
...tring.prototype.slice method.
Just by:
str.slice(-1);
A negative start index slices the string from length+index, to length, being index -1, the last character is extracted:
"abc".slice(-1); // "c";
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Should each and every table have a primary key?
...s, most RDBMS engines will benefit from including these fields in a unique index.
And since any primary key involves creating a unique index, you should declare it and get both logical consistency and performance.
See this article in my blog for why you should always create a unique index on uniqu...
ALTER TABLE without locking the table?
.../O overhead associated with copying the table and reconstructing secondary indexes.
see MySQL 5.6 Reference Manual -> InnoDB and Online DDL for more info.
It seems that online DDL also available in MariaDB
Alternatively you can use ALTER ONLINE TABLE to ensure that your ALTER
TABLE does n...