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What is the difference between CMD and ENTRYPOINT in a Dockerfile?
... the image without any argument will ping the localhost:
$ docker run -it test
PING localhost (127.0.0.1): 48 data bytes
56 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.096 ms
56 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.088 ms
56 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.088 ms
^C--- l...
Using Default Arguments in a Function
... ReflectionFunction('foo'))->getParameters()[1]->getDefaultValue(), 'test');
Whether you would want to do so is another story :)
UPDATE:
The reasons to avoid this solution are:
it is (arguably) ugly
it has an obvious overhead.
as the other answers proof, there are alternatives
But it can a...
Count all occurrences of a string in lots of files with grep
...one shows the relevant files and then the total count of matches: grep -rc test . | awk -F: '$NF > 0 {x+=$NF; $NF=""; print} END{print "Total:",x}'
– Yaron
Sep 6 '17 at 11:40
...
'is' versus try cast with null check
...actually happens below the belt. Take a look at this example:
object o = "test";
if (o is string)
{
var x = (string) o;
}
This translates to the following IL:
IL_0000: nop
IL_0001: ldstr "test"
IL_0006: stloc.0 // o
IL_0007: ldloc.0 // o
IL_0008: isinst Syste...
How do I pass a method as a parameter in Python
...e is your example re-written to show a stand-alone working example:
class Test:
def method1(self):
return 'hello world'
def method2(self, methodToRun):
result = methodToRun()
return result
def method3(self):
return self.method2(self.method1)
test = Tes...
Determine project root from a running node.js application
... That means that you can determine whether a file has been run directly by testing require.main === module
Because module provides a filename property (normally equivalent to __filename), the entry point of the current application can be obtained by checking require.main.filename.
So if you w...
What are best practices for validating email addresses on iOS 2.0
...7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES[c] %@", emailRegex];
return [emailTest evaluateWithObject:candidate];
}
share
...
Is Java's assertEquals method reliable?
... seems that String.equals() is a better approach. Well, I'm doing JUnit testing and my inclination is to use assertEquals(str1, str2) . Is this a reliable way to assert two Strings contain the same content? I would use assertTrue(str1.equals(str2)) , but then you don't get the benefit of seei...
Passing Objects By Reference or Value in C#
...One more code sample to showcase this:
void Main()
{
int k = 0;
TestPlain(k);
Console.WriteLine("TestPlain:" + k);
TestRef(ref k);
Console.WriteLine("TestRef:" + k);
string t = "test";
TestObjPlain(t);
Console.WriteLine("TestObjPlain:" +t);
TestObjRef(ref t...
What is the Swift equivalent of respondsToSelector?
...r:, even if Swift, if you are dealing with NSObject instances:
@interface TestA : NSObject
- (void)someMethod;
@end
@implementation TestA
//this triggers a warning
@end
var a = TestA()
if a.respondsToSelector("someMethod") {
a.someMethod()
}
...