大约有 40,000 项符合查询结果（耗时：0.0289秒） [XML]
How can you run a command in bash over until success
...
You need to test $? instead, which is the exit status of the previous command. passwd exits with 0 if everything worked ok, and non-zero if the passwd change failed (wrong password, password mismatch, etc...)
passwd
while [ $? -ne 0 ]; ...
Passing arguments to C# generic new() of templated type
... question, but new answer ;-)
The ExpressionTree version: (I think the fastests and cleanest solution)
Like Welly Tambunan said, "we could also use expression tree to build the object"
This will generate a 'constructor' (function) for the type/parameters given. It returns a delegate and accept th...
In PHP, can you instantiate an object and call a method on the same line?
...ose names won't conflict.
So, if you declared a class like this :
class Test {
public function __construct($param) {
$this->_var = $param;
}
public function myMethod() {
return $this->_var * 2;
}
protected $_var;
}
You can then declare a function that r...
Jasmine.js comparing arrays
...
Just did the test and it works with toEqual
please find my test:
http://jsfiddle.net/7q9N7/3/
describe('toEqual', function() {
it('passes if arrays are equal', function() {
var arr = [1, 2, 3];
expect(arr).toEqual([...
What's the best practice to round a float to 2 decimals? [duplicate]
...
Let's test 3 methods:
1)
public static double round1(double value, int scale) {
return Math.round(value * Math.pow(10, scale)) / Math.pow(10, scale);
}
2)
public static float round2(float number, int scale) {
int pow =...
What really happens in a try { return x; } finally { x = null; } statement?
...finally {
...
}
return tmp;
for example (using reflector):
static int Test() {
try {
return SomeNumber();
} finally {
Foo();
}
}
compiles to:
.method private hidebysig static int32 Test() cil managed
{
.maxstack 1
.locals init (
[0] int32 CS$1$0000...
What is the difference between typeof and instanceof and when should one be used vs. the other?
...make things clear, you need to know two facts:
The instanceof operator tests whether the prototype property of a constructor appears anywhere in the prototypes chain of an object. In most cases this mean that the object was created by using this constructor or on of its descendant. But also prot...
Is there a sleep function in JavaScript? [duplicate]
...ly different from how sleep method, if it existed, would behave.
function test1()
{
// let's say JavaScript did have a sleep function..
// sleep for 3 seconds
sleep(3000);
alert('hi');
}
If you run the above function, you will have to wait for 3 seconds (sleep method call is...
Checking if an instance's class implements an interface?
...
See: http://php.net/manual/en/function.class-implements.php
Performance Tests
Some simple performance tests show the costs of each approach:
Given an instance of an object
Object construction outside the loop (100,000 iterations)
____________________________________________
| class_implement...
How to avoid explicit 'self' in Python?
...
You can use whatever name you want, for example
class test(object):
def function(this, variable):
this.variable = variable
or even
class test(object):
def function(s, variable):
s.variable = variable
but you are stuck with using a name for the scope....