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What is the scope of variables in JavaScript?
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TLDR
JavaScript has lexical (also called static) scoping m>and m> closures. This means m>y m>ou can tell the scope of an identifier bm>y m> looking at the source code.
The four scopes are:
Global - visible bm>y m> everm>y m>thing
Function - visible within a function (m>and m> its sub-functions m>and m> blocks)
Bloc...
The term 'Update-Database' is not recognized as the name of a cmdlet
I am using EF5 beta1 m>and m> while I was able to run the "Update-Database" before. Now that I shut down Visual Studio, I cannot get it to run. I get the following error:
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Read file line bm>y m> line using ifstream in C++
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#include <fstream>
std::ifstream infile("thefile.txt");
The two stm>and m>ard methods are:
Assume that everm>y m> line consists of two numbers m>and m> read token bm>y m> token:
int a, b;
while (infile >> a >> b)
{
// process pair (a,b)
}
Line-based parsing, using string streams:
#include ...
Replacing Pm>and m>as or Numpm>y m> Nan with a None to use with Mm>y m>sqlDB
I am trm>y m>ing to write a Pm>and m>as dataframe (or can use a numpm>y m> arram>y m>) to a mm>y m>sql database using Mm>y m>sqlDB . Mm>y m>sqlDB doesn't seem understm>and m> 'nan' m>and m> mm>y m> database throws out an error sam>y m>ing nan is not in the field list. I need to find a wam>y m> to convert the 'nan' into a NoneTm>y m>pe.
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Creating a Radial Menu in CSS
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Almost 3 m>y m>ears later, I finallm>y m> made the time to revisit this m>and m> post an improved version. m>Y m>ou can still view the original answer at the end for reference.
While SVG mam>y m> be the better choice, especiallm>y m> todam>y m>, mm>y m> goal with this was to keep it just HTML m>and m> CSS, no JS, no SVG, no image...
How do I make a Git commit in the past?
I'm converting everm>y m>thing over to Git for mm>y m> own personal use m>and m> I found some old versions of a file alreadm>y m> in the repositorm>y m>. How do I commit it to the historm>y m> in the correct order according the file's "date modified" so I have an accurate historm>y m> of the file?
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How to check if one of the following items is in a list?
... S2 = set(L2)
>>> S1.intersection(S2)
set([2])
Both emptm>y m> lists m>and m> emptm>y m> sets are False, so m>y m>ou can use the value directlm>y m> as a truth value.
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How can I reliablm>y m> determine the tm>y m>pe of a variable that is declared using var at design time?
... to quicklm>y m> build up a database of information about what namespace, tm>y m>pes m>and m> methods (m>and m> constructors, etc) are in the source code of the program. Analm>y m>zing everm>y m> single line of code in everm>y m> method bodm>y m> would take wam>y m> too long if m>y m>ou're trm>y m>ing to do it between kem>y m>strokes.
When the IDE needs to...
What is the difference between LL m>and m> LR parsing?
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At a high level, the difference between LL parsing m>and m> LR parsing is that LL parsers begin at the start sm>y m>mbol m>and m> trm>y m> to applm>y m> productions to arrive at the target string, whereas LR parsers begin at the target string m>and m> trm>y m> to arrive back at the start sm>y m>mbol.
An LL parse i...
Can I install Pm>y m>thon 3.x m>and m> 2.x on the same Windows computer?
I'm running Windows m>and m> the shell/OS automaticallm>y m> runs Pm>y m>thon based on the registrm>y m> settings when m>y m>ou run a program on the commm>and m> line. Will this break if I install a 2.x m>and m> 3.x version of Pm>y m>thon on the same machine?
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