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switch / pattern matching idea
...tPrice (v : Vehicle) =
match v with
| :? Motorcycle as bike -> 100 + bike.Cylinders * 10
| :? Bicycle -> 30
| :? Car as car when car.EngineType = Diesel -> 220 + car.Doors * 20
| :? Car as car when car.EngineType = Gasoline -> 200 + car.Doors * 20
| _ -> failw...
The SQL OVER() clause - when and why is it useful?
..., i.e. like this:
SELECT
orig.[Partition],
orig.Value,
orig.Value * 100.0 / agg.TotalValue AS ValuePercent
FROM OriginalRowset orig
INNER JOIN (
SELECT
[Partition],
SUM(Value) AS TotalValue
FROM OriginalRowset
GROUP BY [Partition]
) agg ON orig.[Partition] = agg.[P...
GroupBy pandas DataFrame and select most common value
...pd.Series.mode)
5.56 ms ± 343 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
2.76 ms ± 387 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
Dealing with Multiple Modes
Series.mode also does a good job when there are multiple modes:
source2 = source.append(
pd.Serie...
How to map calculated properties with JPA and Hibernate
...n this article:
@Formula(
"round(" +
" (interestRate::numeric / 100) * " +
" cents * " +
" date_part('month', age(now(), createdOn)" +
") " +
"/ 12) " +
"/ 100::numeric")
private double interestDollars;
...
Return array in a function
...on plain C arrays and many other types of collection, for example
int arr[100];
int *foo = fillarr(arr, arr+100);
Which now looks an awful lot like the plain pointer examples given elsewhere in this question.
share
...
String output: format or concat in C#?
...ided the result by some iterations was wrong. See what happens if you have 1000 milliseconds and 100 milliseconds. In both situations, you will get 0 ms after dividing it by 1000000.
Stopwatch s = new Stopwatch();
var p = new { FirstName = "Bill", LastName = "Gates" };
int n = 1000000;
long fElap...
Performing Inserts and Updates with Dapper
...o, refer to https://msdn.microsoft.com/en-us/library/vstudio/dd456872(v=vs.100).aspx. </param>
/// <typeparam name="TModel"></typeparam>
/// <param name="model">The model object containing all the values that passes as Stored Procedure's parameter.</param&g...
Current time formatting with Javascript
...function() {
if ((nYear&3)!==0) return false;
return nYear%100!==0 || nYear%400===0;
},
getThursday = function() {
var target = new Date(date);
target.setDate(nDate - ((nDay+6)%7) + 3);
return target;
},
zeroPad = function(nNum, nPad) {
return ...
Cleaner way to do a null check in C#? [duplicate]
...essCalculator().CalculateMoney();
Console.WriteLine(businessDA.Money * 100d);
}
}
The DoAnAction method violates the Law of Demeter. In one function, it accesses a BusinessCalcualtor, a BusinessData, and a decimal. This means that if any of the following changes are made, the line will have ...
C# switch statement limitations - why?
...
100
This is my original post, which sparked some debate... because it is wrong:
The switch sta...