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Immutable array in Java
Is there an immutable alternative to the primitive arrays in Java? Making a primitive array final doesn't actually prevent one from doing something like
...
Finding three elements in an array whose sum is closest to a given number
...irst, we invest some time to sort the array, which costs us an initial penalty of O(n log n). Now we execute this algorithm:
for (i in 1..n-2) {
j = i+1 // Start right after i.
k = n // Start at the end of the array.
while (k >= j) {
// We got a match! All done.
if (A[i] + A[j...
Best way to convert an ArrayList to a string
...why it is not desirable, and which code should be used instead:
ArrayList<String> list = new ArrayList<String>();
list.add("one");
list.add("two");
list.add("three");
String listString = "";
for (String s : list)
{
listString += s + "\t";
}
System.out.println(listString);
In fa...
How to compare two NSDates: Which is more recent?
...
I like to rely on the fact that NSOrderedAscending < 0 and NSOrderedDescending > 0. That makes the comparison easier to read: [date1 compare:date2] < 0 /* date1 < date2 */ and avoids the (easy to make) mistake @albertamg pointed out. ;-)
– jp...
Using smart pointers for class members
...live). The simplest kind of observing pointer is a raw pointer:
#include <memory>
class Device {
};
class Settings {
std::unique_ptr<Device> device;
public:
Settings(std::unique_ptr<Device> d) {
device = std::move(d);
}
Device* getDevice() {
retu...
Use HTML5 to resize an image before upload
... I moved the file input outside of the form so that it is not submitted:
<input name="imagefile[]" type="file" id="takePictureField" accept="image/*" onchange="uploadPhotos(\'#{imageUploadUrl}\')" />
<form id="uploadImageForm" enctype="multipart/form-data">
<input id="name" value...
How can I hide an HTML table row so that it takes up no space?
How can I hide an HTML table row <tr> so that it takes up no space? I have several <tr> 's set to style="display:none;" , but they still affect the size of the table and the table's border reflects the hidden rows.
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How to pass parameters correctly?
... for instance temporaries, or objects you're about to move from as the result of calling std::move()).
One could also argue that for fundamental types or types for which copying is fast, such as int, bool, or char, there is no need to pass by reference if the function simply needs to observe the va...
C# - how to determine whether a Type is a number
...ase TypeCode.Double:
case TypeCode.Single:
return true;
default:
return false;
}
}
Usage:
int i = 32;
i.IsNumericType(); // True
string s = "Hello World";
s.IsNumericType(); // False
share
...
How to enumerate an enum with String type?
...llCases: [Self] {
return [Self](AnySequence { () -> AnyIterator<Self> in
var raw = 0
var first: Self?
return AnyIterator {
let current = withUnsafeBytes(of: &raw) { $0.load(as: Self.self) }
if raw == 0 {
...