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In Firebase, is there a way to get the number of children of a node without loading all the node dat
...lue) {
return (current_value || 0) + 1;
});
For more info, see https://www.firebase.com/docs/transactions.html
UPDATE:
Firebase recently released Cloud Functions. With Cloud Functions, you don't need to create your own Server. You can simply write JavaScript functions and upload it to Firebase....
PHP “pretty print” json_encode [duplicate]
..._decode($string);
echo json_encode($json, JSON_PRETTY_PRINT);
See http://www.php.net/manual/en/function.json-encode.php
Note: Don't forget to echo "<pre>" before and "</pre>" after, if you're printing it in HTML to preserve formatting ;)
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Why does pthread_cond_wait have spurious wakeups?
...r Corporation POSIX Thread Architect |
| My book: http://www.awl.com/cseng/titles/0-201-63392-2/ |
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How do I select an element with its name attribute in jQuery? [duplicate]
... very simple getting a name:
$('[name=elementname]');
Resource:
http://www.electrictoolbox.com/jquery-form-elements-by-name/ (google search: get element by name jQuery - first result)
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im...
Get the first element of each tuple in a list in Python [duplicate]
...refer comprehensions over higher-order functions such as map, go to http://www.artima.com/weblogs/viewpost.jsp?thread=98196.
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How do I get Windows to go as fast as Linux for compiling C++?
...ge of). Look at this selection of Unix-related performance papers: http://www.eecs.harvard.edu/margo/papers/ or look up the history of papers by Osterhaus, Henry Spencer, or others. Heck, one of the biggest (and most enjoyable to watch) debates in Unix history was the back and forth between Osterha...
App Inventor 2 语音识别及文本朗读组件的使用 · App Inventor 2 中文网
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应用市场搜索安装，应用市场找不到的请点此（https://www.pgyer.com/yyyq）下载apk安装。
设置
语音识别引擎不用设置，安装完成后，当触发需要识别语音时，系统会弹出对话框让你选择使用哪个识别引擎，这时...
git revert back to certain commit [duplicate]
...
http://www.kernel.org/pub/software/scm/git/docs/git-revert.html
using git revert <commit> will create a new commit that reverts the one you dont want to have.
You can specify a list of commits to revert.
An alternative: htt...
使用TokuMX配置Replica Set集群 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...请参见《TokuMX vs. MongoDB 性能对比》。
下载地址：http://www.tokutek.com/tokumx-for-mongodb/
TokuMX目前只有Linux版本，下载完成后
解压(tar -zxvf xxxx.tar.gz)
进入bin目录，新建配置文件如：tokumx.conf （文件名随意）
内容如下：
logpath=/ho...
Byte order mark screws up file reading in Java
... * (Byte Order Mark) at its beginning, as defined by
* <a href="http://www.faqs.org/rfcs/rfc3629.html">RFC 3629 - UTF-8, a transformation format of ISO 10646</a>
*
* <p>The
* <a href="http://www.unicode.org/unicode/faq/utf_bom.html">Unicode FAQ</a>
* defines 5 typ...