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What is the explanation for these bizarre JavaScript behaviours mentioned in the 'Wat' talk for Code
...cript.
The basic idea was simple JavaScript wanted to allow both of these forms:
if (u)
v;
if (x) {
y;
z;
}
To do so, two interpretations were made of the opening brace: 1. it is not required and 2. it can appear anywhere.
This was a wrong move. Real code doesn't have an opening br...
Counting array elements in Python [duplicate]
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Especially when both of us mentioned that is was bad form. Understanding what length "really" does is important in it's own right.
– Gregg Lind
Oct 14 '08 at 17:11
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Counting the number of option tags in a select tag in jQuery
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You can use either length property and length is better on performance than size.
$('#input1 option').length;
OR you can use size function like (removed in jQuery v3)
$('#input1 option').size();
$(document).ready(function(){
console.log($('#input1 option').size());
console....
Django dynamic model fields
...define their own data fields (via the admin) to collect additional data in forms and report on the data. The latter bit makes JSONField not a great option, so instead I have the following solution:
...
Git and Mercurial - Compare and Contrast
...sions (plugins) and established API; Git has scriptability and established formats.
There are a few things that differ Mercurial from Git, but there are other things that make them similar. Both projects borrow ideas from each other. For example hg bisect command in Mercurial (formerly bisect ex...
How to select the last record of a table in SQL?
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Without any further information, which Database etc the best we can do is something like
Sql Server
SELECT TOP 1 * FROM Table ORDER BY ID DESC
MySql
SELECT * FROM Table ORDER BY ID DESC LIMIT 1
...
Python style - line continuation with strings? [duplicate]
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The problem is when assigning to a variable, this form looks too similar to a tuple. If you add a comma between the strings, it's a tuple with two strings.
– Eric
Mar 23 '19 at 1:41
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Recommended way to insert elements into map [duplicate]
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assert( myMap.find( key )->second == value ); // post-condition
This form will overwrite any existing entry.
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CMake not able to find OpenSSL library
... Works like a charm, thanks! I was able to extract the zip file downloaded form the link you mentioned. After that I just added -DOPENSSL_ROOT-DIR="C:/Path/To/Extracted/Files".
– Charlie Vieillard
Apr 9 '15 at 8:05
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Difference between Covariance & Contra-variance
...orresponding type in the second set is IEnumerable<T>. Or, in short form, the mapping is T → IE<T>. Notice that this is a "thin arrow".
With me so far?
Now let's consider a relation. There is an assignment compatibility relationship between pairs of types in the first set. A value o...