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Java 8 stream reverse order
...t;Integer> list = Arrays.asList(1,2,3,4);
list.stream()
.boxed() // Converts Intstream to Stream<Integer>
.sorted(Collections.reverseOrder()) // Method on Stream<Integer>
.forEach(System.out::println);
...
Java ArrayList how to add elements at the beginning
...optimized for adding elements at the first index. Mind though, that if you convert your collection to one of these, the conversation will probably need a time and space complexity of O(n)
Deque
The JDK includes the Deque structure which offers methods like addFirst(e) and offerFirst(e)
Deque<...
What is a lambda (function)?
...ow.FieldName > 15 );
LinqToSql can read that function (x > 15) and convert it to the actual SQL to execute using expression trees.
The statement above becomes:
select ... from [tablename]
where [FieldName] > 15 --this line was 'read' from the lambda function
This is different fr...
What is the best project structure for a Python application? [closed]
... I don't tend to consider Django a good example -- playing tricks with sys.path is an instant DQ in my book.
– Charles Duffy
Oct 29 '10 at 16:20
18
...
Most common C# bitwise operations on enums
...(bit => ((flags.GetTypeCode() == TypeCode.UInt64 ? (long)(ulong)flags : Convert.ToInt64(flags)) & (1L << bit)) != 0)
.Select(bit => Enum.ToObject(flags.GetType(), 1L << bit))`
Enums.NET flags.GetFlags()
I'm trying to get these improvements incorporated into .NET Core and...
What happens when a computer program runs?
...lso note, these aren't actual lines of C code executing. The compiler has converted them into machine language instructions in your executable. They are then (generally) copied from the TEXT area into the CPU pipeline, then into the CPU registers, and executed from there. [This was incorrect. Se...
T-SQL get SELECTed value of stored procedure
... for INTs, because RETURN can only return a single int value and nulls are converted to a zero.
OUTPUT PARAMETER
you can use an output parameter:
CREATE PROCEDURE GetMyInt
( @Param int
,@OutValue int OUTPUT)
AS
SELECT @OutValue=MyIntField FROM MyTable WHERE MyPrimaryKeyField = @Param
RETURN ...
T-SQL datetime rounded to nearest minute and nearest hours with using functions
...
DECLARE @date As DateTime2
SET @date = '2007-09-22 15:07:38.850'
SELECT CONVERT(VARCHAR(16), @date, 120) --2007-09-22 15:07
SELECT CONVERT(VARCHAR(13), @date, 120) --2007-09-22 15
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improv...
How can I calculate the difference between two dates?
...s of time, they do not have any associated time-zone information. When you convert a string to a date using e.g. an NSDateFormatter, the NSDateFormatter converts the time from the configured timezone. Therefore, the number of seconds between two NSDate objects will always be time-zone-agnostic.
Fur...
Can virtual functions have default parameters?
.... However since no one mentions simple and effective solution, here it is: Convert your parameters to struct and then you can have default values to struct members!
So instead of,
//bad idea
virtual method1(int x = 0, int y = 0, int z = 0)
do this,
//good idea
struct Param1 {
int x = 0, y = 0...