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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<...
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 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...
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 ...
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...
Jquery Ajax Posting json to webservice
...uses (JavaScriptSerializer) is pretty flexible, and will do what it can to convert your input data into the server-side type you specify.
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Change type of varchar field to integer: “cannot be cast automatically to type integer”
...YPE integer USING (trim(col_name)::integer);
to strip white space before converting.
This shoud've been obvious from an error message if the command was run in psql, but it's possible PgAdmin-III isn't showing you the full error. Here's what happens if I test it in psql on PostgreSQL 9.2:
=> ...
Counting Chars in EditText Changed Listener
...
@MartinLockett use Integer.toString(int_type) to convert string to int.
– Mehdi Rostami
Jun 5 '16 at 17:09
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How to print a percentage value in python?
...
You are dividing integers then converting to float. Divide by floats instead.
As a bonus, use the awesome string formatting methods described here: http://docs.python.org/library/string.html#format-specification-mini-language
To specify a percent convers...
I want to get Year, Month, Day, etc from Java Date to compare with Gregorian Calendar date in Java.
...
With Java 8 and later, you can convert the Date object to a LocalDate object and then easily get the year, month and day.
Date date = new Date();
LocalDate localDate = date.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
int year = localDate.ge...