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Callback after all asynchronous forEach callbacks are completed
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Array.forEach does not provide this nicety (oh if it would) but there are several ways to accomplish what you want:
Using a simple counter
function callback () { console.log('all done'); }
var itemsProcessed = 0;
[1, 2, 3].forEach((item, index, array) => {
asyncFunction(item,...
How do I check if a variable exists?
I want to check if a variable exists. Now I'm doing something like this:
11 Answers
11...
How to find the Number of CPU Cores via .NET/C#?
Is there a way via .NET/C# to find out the number of CPU cores?
11 Answers
11
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How to remove multiple indexes from a list at the same time? [duplicate]
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You need to do this in a loop, there is no built-in operation to remove a number of indexes at once.
Your example is actually a contiguous sequence of indexes, so you can do this:
del my_list[2:6]
which removes the slice starting at 2 and ending just before 6.
It...
What's a monitor in Java?
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A monitor is mechanism to control concurrent access to an object.
This allows you to do:
Thread 1:
public void a()
{
synchronized(someObject) {
// do something (1)
}
}
Thread 2:
public void b()
{
synchronized(someObject) {
// do something else (2)
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What's so bad about Template Haskell?
It seems that Template Haskell is often viewed by the Haskell community as an unfortunate convenience. It's hard to put into words exactly what I have observed in this regard, but consider these few examples
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Check if a temporary table exists and delete if it exists before creating a temporary table
I am using the following code to check if the temporary table exists and drop the table if it exists before creating again. It works fine as long as I don't change the columns. If I add a column later, it will give an error saying "invalid column". Please let me know what I am doing wrong.
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Using 'starts with' selector on individual class names
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answered Feb 1 '10 at 17:01
Josh StodolaJosh Stodola
76.3k4242 gold badges177177 silver badges220220 bronze badges
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How can I measure the similarity between two images? [closed]
I would like to compare a screenshot of one application (could be a Web page) with a previously taken screenshot to determine whether the application is displaying itself correctly. I don't want an exact match comparison, because the aspect could be slightly different (in the case of a Web app, depe...
Convert an image to grayscale in HTML/CSS
Is there a simple way to display a color bitmap in grayscale with just HTML/CSS ?
25 Answers
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