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What is the difference between pluck and collect in Rails?
... Because it will retrieve all the columns from user table in the database, allocates the memory for each attributes (including the attributes which you will never use)
NOTE: pluck does not return ActiveRecord_Relation of the user
...
Which cryptographic hash function should I choose?
... specifically for passwords, or for challenge-response auth, or for access tokens, or just to index a bunch of strings/files. Performance, on the other hand, is a concern for the OP...
– Seva Alekseyev
May 23 '19 at 17:33
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Bootstrap: align input with button
...
For me it did not work if creating an extra span tag to allocated the class, but it worked if I added that class to the div tag: <div class="form-group input-group-btn">
– J0ANMM
Dec 19 '16 at 17:34
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Why use String.Format? [duplicate]
...the exact size of the destination string is known ahead of time and can be allocated immediately and each character copied only once.
– csauve
Jan 12 '11 at 17:44
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SQL select join: is it possible to prefix all columns as 'prefix.*'?
...result set for a list of columns in a scripting language such as Python or PHP.
SELECT '' as table1_dummy, table1.*, '' as table2_dummy, table2.*, '' as table3_dummy, table3.* FROM table1
JOIN table2 ON table2.table1id = table1.id
JOIN table3 ON table3.table1id = table1.id
I realize this doesn't ...
Nesting await in Parallel.ForEach
...l still wait for all tasks to complete, and GetPartitions will dynamically allocate elements when partition.MoveNext is called until no more elements are left to process. This means that unless you add your own mechanism for stopping the processing (e.g. CancellationToken) it won't happen on its own...
Generate a Hash from string in Javascript
... is faster, because my version has to turn the string into an array first, allocating new memory and copying every character...
– lordvlad
Feb 22 '15 at 10:04
5
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Return all enumerables with yield return at once; without looping through
...rhead if all the client really needs is to enumerate through it, since you allocate the data structures for all elements in advance. Also, if you delegate to another method that's returning a sequence, then capturing it as a collection involves extra copying, and you do not know how many items (and ...
App store link for “rate/review this app”
...sUserReviews?type=Purple+Software&id=%@";
NSString* url = [[NSString alloc] initWithFormat: ([[UIDevice currentDevice].systemVersion floatValue] >= 7.0f) ? iOS7AppStoreURLFormat : iOSAppStoreURLFormat, cAppleID];
[[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]];
}
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java: (String[])List.toArray() gives ClassCastException
...hat type of array to create.
use
toArray(new String[v2.size()]);
which allocates the right kind of array (String[] and of the right size)
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