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What does middleware and app.use actually mean in Expressjs?
...re but I haven't found a clear, concise explanation of what middleware actually is and what the app.use statement is doing. Even the express docs themselves are a bit vague on this. Can you explain these concepts for me please?
...
When to use window.opener / window.parent / window.top
...
window.opener refers to the window that called window.open( ... ) to open the window from which it's called
window.parent refers to the parent of a window in a <frame> or <iframe>
window.top refers to the top-most window from a window nested in one or mo...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
...is a simple demonstration:
while true; do
read -p "Do you wish to install this program?" yn
case $yn in
[Yy]* ) make install; break;;
[Nn]* ) exit;;
* ) echo "Please answer yes or no.";;
esac
done
Another method, pointed out by Steven Huwig, is Bash's select co...
How to check if an object is a certain type
...ou can simply compare them using the Is operator.
So your code should actually be written like this:
Sub FillCategories(ByVal Obj As Object)
Dim cmd As New SqlCommand("sp_Resources_Categories", Conn)
cmd.CommandType = CommandType.StoredProcedure
Obj.DataSource = cmd.ExecuteReader
I...
Which parallel sorting algorithm has the best average case performance?
...If we have O(n) processors we would hope for a linear speedup. O(log n) parallel algorithms exist but they have a very high constant. They also aren't applicable on commodity hardware which doesn't have anywhere near O(n) processors. With p processors, reasonable algorithms should take O(n/p log n) ...
Server polling with AngularJS
...
You should be calling the tick function in the callback for query.
function dataCtrl($scope, $timeout, Data) {
$scope.data = [];
(function tick() {
$scope.data = Data.query(function(){
$timeout(tick, 1000);
...
How to save traceback / sys.exc_info() values in a variable?
...traceback.format_exc()
...
>>> print var
Traceback (most recent call last):
File "<stdin>", line 2, in <module>
ValueError: invalid literal for int() with base 10: 'k'
You should however take a look at the traceback documentation, as you might find there more suitable metho...
Relatively position an element without it taking up space in document flow
... creating a zero-width, zero-height, relatively positioned element, essentially solely for the purpose of creating a reference point for position, and an absolutely positioned element within that:
<div style="position: relative; width: 0; height: 0">
<div style="position: absolute; lef...
Difference between SelectedItem, SelectedValue and SelectedValuePath
...{
public int CategoryID { get; set; }
}
It's a little confusing initially, but hopefully this makes it a bit clearer... :)
Chris
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Difference between classification and clustering in data mining? [closed]
...ome kind of relationship (by being closer together in some model). You normally don't find classes (if you think that you use clustering to find classes for classification). That is not the case. Instead, you have a training set at the beginning which consist of labelled items (so you know which cla...