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Java's Interface and Haskell's type class: differences and similarities?
...a ways to fake this by making an interface with generic parameter that is expected to be the same type as the object itself, like how Comparable<T> does it, where you are expected to use Foo implements Comparable<Foo> so that the compareTo(T otherobject) kind of has type t -> t -> ...
How do you use the ellipsis slicing syntax in Python?
...up in Hidden features of Python , but I can't see good documentation or examples that explain how the feature works.
4 An...
How do I bind a WPF DataGrid to a variable number of columns?
...ove)
{
dataGrid.Columns.Move(ne.OldStartingIndex, ne.NewStartingIndex);
}
else if (ne.Action == NotifyCollectionChangedAction.Remove)
{
foreach (DataGridColumn column in ne.OldItems)
{
...
Go Unpacking Array As Arguments
...
You can use a vararg syntax similar to C:
package main
import "fmt"
func my_func( args ...int) int {
sum := 0
for _,v := range args {
sum = sum + v
}
return sum;
}
func main() {
arr := []int{2,4}
sum := my_func(arr...)
...
Clean way to launch the web browser from shell script?
...
xdg-open is standardized and should be available in most distributions.
Otherwise:
eval is evil, don't use it.
Quote your variables.
Use the correct test operators in the correct way.
Here is an example:
#!/bin/bash
if ...
What are the advantages of NumPy over regular Python lists?
...cision numbers takes 4 bytes each, double-precision ones, 8 bytes. Less flexible, but you pay substantially for the flexibility of standard Python lists!
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How to use the toString method in Java?
Can anybody explain to me the concept of the toString() method, defined in the Object class? How is it used, and what is its purpose?
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Why does `True == False is False` evaluate to False? [duplicate]
I get some rather unexpected behavior on an expression that works with == but not with is :
4 Answers
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Select distinct using linq [duplicate]
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Using morelinq you can use DistinctBy:
myList.DistinctBy(x => x.id);
Otherwise, you can use a group:
myList.GroupBy(x => x.id)
.Select(g => g.First());
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Is there a way to specify an “empty” C# lambda expression?
I'd like to declare an "empty" lambda expression that does, well, nothing.
Is there a way to do something like this without needing the DoNothing() method?
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