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Combine multiple Collections into a single logical Collection?
... how, the underlying objects in the lists aren't copied and ArrayList just allocates the space and calls System.arraycopy() under the hood. Can't get much more efficient than that.
– Qwerky
Feb 4 '11 at 10:21
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How to convert int to NSString?
...:
NSInteger n = 10000;
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
formatter.numberStyle = NSNumberFormatterDecimalStyle;
NSString *string = [formatter stringFromNumber:@(n)];
In the US, for example, that would create a string 10,000, but in Germany, that would be 10.000.
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What is the formal difference in Scala between braces and parentheses, and when should they be used?
...-notation.
Note also that when you have a single parameter that is a multi-token expression, like x + 2 or a => a % 2 == 0, you have to use parenthesis to indicate the boundaries of the expression.
Tuples
Because you can omit parenthesis sometimes, sometimes a tuple needs extra parenthesis like i...
Performance of Java matrix math libraries? [closed]
...o use "raw" MOV instructions as you'd expect; it makes decisions on how to allocate variables to registers when it can; it re-orders instructions to take advantage of processor architecture... A possible exception is that as I mentioned, Hotspot will only perform one operation per SSE instruction; i...
TypeScript: Creating an empty typed container array
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The issue of correctly pre-allocating a typed array in TypeScript was somewhat obscured for due to the array literal syntax, so it wasn't as intuitive as I first thought.
The correct way would be
var arr : Criminal[] = [];
This will give you a cor...
What's the difference between TRUNCATE and DELETE in SQL
...cle
If you use the REUSE STORAGE clause then the data segments are not de-allocated, which can be marginally more efficient if the table is to be reloaded with data. The high water mark is reset.
Row scope
Delete can be used to remove all rows or only a subset of rows. Truncate removes all rows...
What is the equivalent of “!=” in Excel VBA?
...ompare Integers. Additionally, when you do a = "" that second "" has to be allocated as its own string first in memory, then compared to your target string.
– LimaNightHawk
Oct 5 '17 at 16:41
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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
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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
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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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