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using lodash .groupBy. how to add your own keys for grouped output?
...ers: value }))
.value()
);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
Original Answer
var result = _.chain(data)
.groupBy("color")
.pairs()
.map(function(currentItem) {
return _.object(_.zip(["color"...
How to clear the interpreter console?
...lly keep a console window open with the Python interpreter running to test commands, dir() stuff, help() stuff , etc.
36...
Concurrent HashSet in .NET Framework?
...ortunately. However, there are some workarounds.
ConcurrentDictionary (recommended)
This first one is to use the class ConcurrentDictionary<TKey, TValue> in the namespace System.Collections.Concurrent. In the case, the value is pointless, so we can use a simple byte (1 byte in memory).
pri...
Change auto increment starting number?
...INCREMENT value, but it has been fixed in 5.6.16 and 5.7.4, see bugs.mysql.com/bug.php?id=69882
– Daniel Vandersluis
Apr 9 '14 at 14:35
3
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Eclipse hangs on loading workbench
...
The procedure shown at
http://off-topic.biz/en/eclipse-hangs-at-startup-showing-only-the-splash-screen/
worked for me:
cd .metadata/.plugins
mv org.eclipse.core.resources org.eclipse.core.resources.bak
Start eclipse. (It should show an error mess...
Custom HTTP headers : naming conventions
... our users have asked us to include data relative to their account in the HTTP headers of requests we send them, or even responses they get from our API.
What is the general convention to add custom HTTP headers, in terms of naming , format ... etc.
...
Detecting touch screen devices with Javascript
...ies you could hook into them to write you mobile specific code.
See here: http://www.forabeautifulweb.com/blog/about/hardboiled_css3_media_queries/
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Pass request headers in a jQuery AJAX GET call
...
Use beforeSend:
$.ajax({
url: "http://localhost/PlatformPortal/Buyers/Account/SignIn",
data: { signature: authHeader },
type: "GET",
beforeSend: function(xhr){xhr.setRequestHeader('X-Test-Header', 'test-value');},
succes...
App Inventor 2 动态创建组件与布局教程 · App Inventor 2 中文网
...何实现动态创建？
方案一：使用 MIT 官方 Dynamic Components 扩展
方案二：使用 Taifun 的扩展（TaifunDW）
方案三：预置可见组件 + 数据源控制
方案四：使用ListView的动态条目
推荐方案
三、Dynamic Compone...
Example for boost shared_mutex (multiple reads/one write)?
...(This has been discussed elsewhere but the most interesting thread is here http://thread.gmane.org/gmane.comp.lib.boost.devel/214394)
However I did find an important (undocumented) difference between a thread waiting for an upgrade to a lock (ie needs to wait for all readers to release the shared l...