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How to write a Ruby switch statement (case…when) with regex and backreferences?
...egex matching groups are always stored in pseudo variables $1 to $9:
case foo
when /^([0-9][0-9])/
print "the month is #{$1}"
else
print "something else"
end
You can also use the $LAST_MATCH_INFO pseudo variable to get at the whole MatchData object. This can be useful when using named cap...
Cross compile Go on OSX?
...quivalent. While in some other Shell, e.g. FISH shell, it does not support FOO=bar cmd, so you have to use env FOO=bar cmd. Thus I think the biggest advantage to use env FOO=bar cmd is compatibility.
– PickBoy
Dec 1 '16 at 12:12
...
Why is it impossible to build a compiler that can determine if a C++ function will change the value
...able (or halt) for every possible function.
Here's an easy example:
void foo() {
if (bar() == 0) this->a = 1;
}
How can a compiler determine, just from looking at that code, whether foo will ever change a? Whether it does or doesn't depends on conditions external to the function, namely t...
Dual emission of constructor symbols
...e Itanium C++ ABI.
According to the ABI, the mangled name for your Thing::foo() is easily parsed:
_Z | N | 5Thing | 3foo | E | v
prefix | nested | `Thing` | `foo`| end nested | parameters: `void`
You can read the constructor names similarly, as below. Notice how the constructor ...
Is there a MySQL command to convert a string to lowercase?
...
SELECT LOWER(foo) AS foo FROM bar
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How do I enumerate the properties of a JavaScript object? [duplicate]
...ated, but also from the prototypes of any parent objects.
var myObject = {foo: 'bar'};
for (var name in myObject) {
alert(name);
}
// results in a single alert of 'foo'
Object.prototype.baz = 'quux';
for (var name in myObject) {
alert(name);
}
// results in two alerts, one for 'foo' and on...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
...the mongo shell:
MongoDB shell version: 1.6.5
connecting to: test
> db.foo.insert({_id: 'abc'})
> db.bar.insert({_id: 'abc'})
> db.foo.find({_id: 'abc'})
{ "_id" : "abc" }
> db.bar.find({_id: 'abc'})
{ "_id" : "abc" }
> db.foo.insert({_id: 'abc', data:'xyz'})
E11000 duplicate key err...
Access to Modified Closure (2)
...onymous handler, the trick is to capture the handler itself:
EventHandler foo = delegate {...code...};
obj.SomeEvent += foo;
...
obj.SomeEvent -= foo;
Likewise, if you want a once-only event-handler (such as Load etc):
EventHandler bar = null; // necessary for "definite assignment"
bar = delegat...
Using PHP with Socket.io
...lient::TYPE_EVENT,
null,
null,
json_encode(array('name' => 'foo', 'args' => 'bar'))
);
$elephant->close();
echo 'tryin to send `bar` to the event `foo`';
socket io server
var io = require('socket.io').listen(8000);
io.sockets.on('connection', function (socket) {
console.l...
How to write an async method with out parameter?
...urn result utilizes the method signature defined property names. e.g:
var foo = await TryLogin(request);
if (foo.IsSuccess)
return foo.Result;
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