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How do I sort an array of hashes by a value in the hash?
... sort in-place. (Do you have a Python background, perhaps?)
Ruby has sort! for in-place sorting, but there's no in-place variant for sort_by in Ruby 1.8. In practice, you can do:
sorted = sort_me.sort_by { |k| k["value"] }
puts sorted
As of Ruby 1.9+, .sort_by! is available for in-place sorting:
so...
SQL Server - When to use Clustered vs non-Clustered Index?
...work. I understand how clustered and non-clustered indexes improve read performance. But one thing I am not sure is that what would be the reasons where I would choose one over the other.
...
Simplest way to read json from a URL in java
... BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
String jsonText = readAll(rd);
JSONObject json = new JSONObject(jsonText);
return json;
} finally {
is.close();
}
}
public static void main(String[] args) throws IOExce...
Android应用开发性能优化完全分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...触发的逻辑方法中存在大量对象分配；
尽量避免在多次for循环中频繁分配对象；
避免在自定义View的onDraw()方法中执行复杂的操作及创建对象（譬如Paint的实例化操作不要写在onDraw()方法中等）；
对于并发下载等类似逻辑的实...
CharSequence VS String in Java?
...s. The result of comparing two objects that implement CharSequence is therefore, in general, undefined. Each object may be implemented by a different class, and there is no guarantee that each class will be capable of testing its instances for equality with those of the other. It is therefore inappr...
Python memory usage of numpy arrays
...
You can use array.nbytes for numpy arrays, for example:
>>> import numpy as np
>>> from sys import getsizeof
>>> a = [0] * 1024
>>> b = np.array(a)
>>> getsizeof(a)
8264
>>> b.nbytes
8192
...
lock(new object()) — Cargo cult or some crazy “language special case”?
... returned a singleton instance, but he said "hey, doesn't c# have keywords for that"?
– Amiram Korach
Aug 20 '12 at 7:42
9
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How do I interactively unstage a particular hunk in git?
...the opposite of git add --patch, according to the documentation. The short form -p also works for both commands.
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How Do I Hide wpf datagrid row selector
...ame="dataGrid1" />
Note that you can also specify a style or template for it also, should you decide you really do like it and want to keep it because you can do something cool with it.
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What does “Splats” mean in the CoffeeScript tutorial?
...dopted Ruby-style splats very early on (see issue 16), but at Douglas Crockford's suggestion, the syntax was changed from *x to x... a couple of weeks later (see issue 45). Nevertheless, CoffeeScripters still refer to the syntax as the "splat" or "splat operator."
As to what they actually do, splat...