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Programmatically find the number of cores on a machine
...ine how many cores a machine has from C/C++ in a platform-independent way? If no such thing exists, what about determining it per-platform (Windows/*nix/Mac)?
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Get all directories within directory nodejs
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Note this breaks if there are symlinks in the directory. Use lstatSync instead.
– Dave
May 9 '17 at 0:37
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Opening a folder in explorer and selecting a file
.../ suppose that we have a test.txt at E:\
string filePath = @"E:\test.txt";
if (!File.Exists(filePath))
{
return;
}
// combine the arguments together
// it doesn't matter if there is a space after ','
string argument = "/select, \"" + filePath +"\"";
System.Diagnostics.Process.Start("explorer.e...
How to create a sequence of integers in C#?
... Note: This creates a sequence starting at 0 with 10 items (ending at 9). If you want 0 through 10, the second parameter would be 11. And if you need an actual array and not IEnumerable<int>, include a call .ToArray().
– Anthony Pegram
Jan 3 '11 at 22:11...
Is there an MD5 Fixed Point where md5(x) == x?
...so have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a fixed point is 1/2128.
Thus, the probability that no 128-bit string is a fixed point is (1 − 1/2128)2128, so the probabili...
Simplest way to wait some asynchronous tasks complete, in Javascript?
...callback) {
conn.collection(name).drop(function(err) {
if (err)
return callback(err);
console.log('dropped');
callback(null, name);
});
}
)});
async.parallel(calls, function(err, result) {
/* this code will run after all ca...
SecurityError: Blocked a frame with origin from accessing a cross-origin frame
I am loading an <iframe> in my HTML page and trying to access the elements within it using Javascript, but when I try to execute my code, I get the following error:
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Using backticks around field names
...of mine works at a place which has a policy which bans them, I'm wondering if there's anything wrong with using backticks around field names in MySQL.
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Determine installed PowerShell version
...etermine what version of PowerShell is installed on a computer, and indeed if it is installed at all?
19 Answers
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In which order should floats be added to get the most precise result?
...e are 1 billion values equal to 1 / (1 billion), and one value equal to 1. If the 1 comes first, then the sum will come to 1, since 1 + (1 / 1 billion) is 1 due to loss of precision. Each addition has no effect at all on the total.
If the small values come first, they will at least sum to something...