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Picking a random element from a set
...ize = myHashSet.size();
int item = new Random().nextInt(size); // In real life, the Random object should be rather more shared than this
int i = 0;
for(Object obj : myhashSet)
{
if (i == item)
return obj;
i++;
}
...
Check if a number is int or float
...t;> y = 12.0
>>> isinstance(y, float)
True
So:
>>> if isinstance(x, int):
print 'x is a int!'
x is a int!
_EDIT:_
As pointed out, in case of long integers, the above won't work. So you need to do:
>>> x = 12L
>>> import numbers
>>> isin...
How can I delete a query string parameter in JavaScript?
... parameter ‘bar’ would match:
?a=b&foobar=c
Also, it would fail if parameter contained any characters that are special in RegExp, such as ‘.’. And it's not a global regex, so it would only remove one instance of the parameter.
I wouldn't use a simple RegExp for this, I'd parse the pa...
串口通信器使用指导 · App Inventor 2 中文网
...bal 等待次数 = 0
global 发送帧 = []
when 按钮_打开.Click() {
if (not 串口通信器1.IsOpen) {
串口通信器1.InitializeSerial()
if (串口通信器1.OpenSerial()) {
缓冲 = []
等待回复 = false
计时器1.TimerEnabled = true
标签_状态.Text = ...
How do I check (at runtime) if one class is a subclass of another?
...
If there's one thing that's a constant on Stack Overflow, it is that any questions with an answer that implies isinstance or issubclass will also be accompanied with lectures about duck typing!
– B Robst...
Deleting a file in VBA
...ere's a function for you:
Sub DeleteFile(ByVal FileToDelete As String)
If FileExists(FileToDelete) Then 'See above
' First remove readonly attribute, if set
SetAttr FileToDelete, vbNormal
' Then delete the file
Kill FileToDelete
End If
End Sub
Aga...
“unary operator expected” error in Bash if condition
...
If you know you're always going to use bash, it's much easier to always use the double bracket conditional compound command [[ ... ]], instead of the Posix-compatible single bracket version [ ... ]. Inside a [[ ... ]] compou...
Check if all checkboxes are selected
How do I check if all checkboxes with class="abc" are selected?
9 Answers
9
...
Check if object is file-like in Python
...ave like a real file, e.g. have a read() and a write method(), but have a different implementation. It is and realization of the Duck Typing concept.
...
How do you do a deep copy of an object in .NET? [duplicate]
...
I've seen a few different approaches to this, but I use a generic utility method as such:
public static T DeepClone<T>(this T obj)
{
using (var ms = new MemoryStream())
{
var formatter = new BinaryFormatter();
formatter.Ser...