大约有 15,482 项符合查询结果（耗时：0.0349秒） [XML]
What is the motivation for bringing Symbols to ES6?
...o account and this way two symbols may be non-unique.
var a1 = Symbol.for("test");
var a2 = Symbol.for("test");
console.log(a1 == a2); //true!
Let's call those symbols "second-type" symbols. They do not intersect with the "first-type" symbols (i.e. the ones defined with Symbol(data)) in any way.
Th...
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
...
print "%.0f msec" % ((time() - t0) * 1000)
# also ~/py/np/kmeans/test-kmeans.py
Some notes added 26mar 2012:
1) for cosine distance, first normalize all the data vectors to |X| = 1; then
cosinedistance( X, Y ) = 1 - X . Y = Euclidean distance |X - Y|^2 / 2
is fast. For bit vectors, k...
What does “use strict” do in JavaScript, and what is the reasoning behind it?
...unge, it is a good idea to apply "use strict" alongside comprehensive unit tests and a strictly configured JSHint build task that will give you some confidence that there is no dark corner of your module that will blow up horribly just because you've turned on Strict Mode. Or, hey, here's another o...
Manually raising (throwing) an exception in Python
...t For me the role of assertions isn't error-checking per se (which is what testing is for), but they set up fences within the code that certain bugs can't get through. So it becomes easier to track down and isolate the bugs, which will inevitably occur. This is just good habits that take little effo...
Can I combine :nth-child() or :nth-of-type() with an arbitrary selector?
...ponding CSS:
table.myClass tr.row.odd {
...
}
If you're using automated testing tools such as Selenium or processing HTML with tools like lxml, many of these tools allow XPath as an alternative:
//table[contains(concat(' ', @class, ' '), ' myClass ')]//tr[contains(concat(' ', @class, ' '), ' row ...
How do I make my GUI behave well when Windows font scaling is greater than 100%
...ll, or at all, at high DPI. If you plan to turn on TForm.Scaled be sure to test at 96, 125, and 150 DPI for every single form in your project, and every single third party and built in control that you use.
Delphi itself is written in Delphi. It has the High DPI awareness flag turned on, for most ...
How to resolve merge conflicts in Git?
...ip Three
Verify your changes with automated tools.
If you have automated tests, run those. If you have a lint, run that. If it's a buildable project, then build it before you commit, etc. In all cases, you need to do a bit of testing to make sure your changes didn't break anything. (Heck, even a m...
Why not use exceptions as regular flow of control?
...y have arbritrary nesting so break's are out as also any kind of condition tests. The if-else pattern is brittle. If I edit out an else or mess up the syntax in some other way, then there is a hairy bug.
Using throw new Success() linearizes the code flow. I use locally defined Success classes -- ch...
What is the recommended approach towards multi-tenant databases in MongoDB?
...nd resources to deal with the complexity of the
design, implementation and testing of this scenario.
If you are not going to have much differences in structure and
functionality in the database for different tenants.
Your application design will allow tenants to make only minimal
customizations at r...
Why '&&' and not '&'?
...ring value;
if(dict.TryGetValue(key, out value) && value.Contains("test"))
{
// Do Something
}
TryGetValue returns false if the supplied key is not found in the dictionary. Because of the short-circuiting nature of &&, value.Contains("test") is only executed, when TryGetValue r...