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What is a Context Free Grammar?
...eory is related to Theory of Computation. Which is the more philosophical side of Computer Science, about deciding which programs are possible, or which will ever be possible to write, and what type of problems is it impossible to write an algorithm to solve.
A regular expression is a way of descri...
pandas read_csv and filter columns with usecols
...using column names rather than integer indices.
usecols is supposed to provide a filter before reading the whole DataFrame into memory; if used properly, there should never be a need to delete columns after reading.
This solution corrects those oddities:
import pandas as pd
from StringIO import S...
Parsing JSON from XmlHttpRequest.responseJSON
...s to parse it with JSON.parse():
var req = new XMLHttpRequest();
req.overrideMimeType("application/json");
req.open('GET', url, true);
req.onload = function() {
var jsonResponse = JSON.parse(req.responseText);
// do something with jsonResponse
};
req.send(null);
Compatibility: This approac...
list every font a user's browser can display
...h. Here you can get the list of fonts without having to test for them individually using dimensions.
You are going have to decide whether to have an exact list at the expense of not working on some devices ( iDevices, browsers without Flash plugin, etc), or a partial list with better support via Ja...
C# Thread safe fast(est) counter
...ange from 0 to 1,000 are required to generate 1,000 random numbers with a midpoint value. To keep track of the number of midpoint values, a variable, midpointCount, is set equal to 0 and incremented each time the random number generator returns a midpoint value until it reaches 10,000. Because three...
IIS Express Immediately shutting-down running site after stopping web application
...ng visual studio 2012 in the first days when I want to stop application in IDE, application was still running on IIS Express, I could browse and work with running application, but now I can't. IIS Immediately shutting-down application if I press stop button. Since I remember I didn't make any change...
Using NSPredicate to filter an NSArray based on NSDictionary keys
...
I thought thats what it said, too. Apparently the quotes aren't needed. I'm not sure exactly what the guide is saying quotes "should" be used for.
– Corey Floyd
Jun 6 '09 at 0:20
...
How to make a promise from setTimeout
...ertain contexts), I'm going to use later as the name of the function to avoid confusion.
Basic Delay
Using native promises (or a faithful polyfill) it would look like this:
function later(delay) {
return new Promise(function(resolve) {
setTimeout(resolve, delay);
});
}
Note that...
Convert Mercurial project to Git [duplicate]
...Mercurial or downgrade fast-export by running git checkout tags/v180317 inside ~/fast-export directory.".
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Is AngularJS just for single-page applications (SPAs)?
...
Not at all. You can use Angular to build a variety of apps. Client-side routing is just a small piece of that.
You have a large list of features that will benefit you outside of client-side routing:
two-way binding
templating
currency formatting
pluralization
reusable controls
RESTful api ...