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What exactly is metaprogramming?
...not in the trivial sense
that the source files contain
characters, and strings are one of the
data types supported by the language.
Lisp code, after it's read by the
parser, is made of data structures
that you can traverse.
If you understand how compilers work,
what's really going...
Copy a stream to avoid “stream has already been operated upon or closed”
...As soon as you call any terminal operation the stream is closed:
Stream<String> stream = Stream.of("d2", "a2", "b1", "b3", "c")
.filter(s -> s.startsWith("a"));
stream.anyMatch(s -> true); // ok
stream.noneMatch(s -> true); // exception
Calling `noneMatch` after `anyMatch` o...
AJAX Mailchimp signup form integration
...sult != "success") {
// Something went wrong, parse data.msg string and display message
} else {
// It worked, so hide form and display thank-you message.
}
}
});
return false;
});
...
How to achieve function overloading in C?
...ce, and you need to mess about a bit if you want your overloads to support string literals. Still overall pretty cool though.
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Parse config files, environment, and command-line arguments, to get a single collection of options
...ile(argparse.Action):
def __call__(self,parser,namespace,values,option_string=None):
# I can never remember if `values` is a list all the time or if it
# can be a scalar string; this takes care of both.
if isinstance(values,basestring):
parser.config_files.app...
Updating address bar with new URL without hash or reloading the page
...he MDN docs.
TL;DR, you can do this:
window.history.pushState("object or string", "Title", "/new-url");
See my answer to Modify the URL without reloading the page for a basic how-to.
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Unicode, UTF, ASCII, ANSI format differences
...ar encoding.
UTF-16: 2 bytes per "code unit". This is the native format of strings in .NET, and generally in Windows and Java. Values outside the Basic Multilingual Plane (BMP) are encoded as surrogate pairs. These used to be relatively rarely used, but now many consumer applications will need to be...
Will using goto leak variables?
...'s not explicitly initialised:
int main() {
goto lol;
{
std::string x;
lol:
x = "";
}
}
// error: jump to label ‘lol’
// error: from here
// error: crosses initialization of ‘std::string x’
... except for certain kinds of object, which the language can handle re...
Node.js: how to consume SOAP XML web service
...r = new xml2js.Parser({explicitArray: false, trim: true});
parser.parseString(body, (err, result) => {
console.log('JSON result', result);
});
};
console.log('E', response.statusCode, response.statusMessage);
};
request(options, callback);
...
How can I extract the folder path from file path in Python?
...ost there with your use of the split function. You just needed to join the strings, like follows.
>>> import os
>>> '\\'.join(existGDBPath.split('\\')[0:-1])
'T:\\Data\\DBDesign'
Although, I would recommend using the os.path.dirname function to do this, you just need to pass the...