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React.js: onChange event for contentEditable
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nice but I guess the call to this.getDOMNode().innerHTML in shouldComponentUpdate is not very optimized right
– Sebastien Lorber
Jun 28 '14 at 14:01
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Most efficient method to groupby on an array of objects
...groupBy() like so:
var groupBy = function(xs, key) {
return xs.reduce(function(rv, x) {
(rv[x[key]] = rv[x[key]] || []).push(x);
return rv;
}, {});
};
console.log(groupBy(['one', 'two', 'three'], 'length'));
// => {3: ["one", "two"], 5: ["three"]}
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What's the difference between CENTER_INSIDE and FIT_CENTER scale types?
I can't tell the difference between ImageView.ScaleType.CENTER_INSIDE and ImageView.ScaleType.FIT_CENTER .
3 Answers
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Anatomy of a “Memory Leak”
...f Programming e-book.
Basically, in .NET a memory leak occurs when referenced objects are rooted and thus cannot be garbage collected. This occurs accidentally when you hold on to references beyond the intended scope.
You'll know that you have leaks when you start getting OutOfMemoryExceptions or ...
自动生成Linux下Makefile全攻略（automake原理） - C/C++ - 清泛网 - 专注C/C++及内核技术
...接在Makefile文件中写编译规则，只是这样复杂度很高，且修改起来不灵活。
为了解决这个难题，GNU推出了automake，根据简单的规则自动生成复杂的Makefile，automake help文档如下：
Usage: /usr/bin/automake [OPTION] ... [Makefile]...
Generate M...
9个常用iptables配置实例 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...lter table，默认的chain策略为ACCEPT，我们可以通过以下命令修改chain的策略：
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP
以上命令配置将接收、转发和发出包均丢弃，施行比较严格的包管理。由于接收和发包均被设...
Why is Magento so slow? [closed]
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I've only been tangentially involved in optimizing Magento for performance, but here's a few reasons why the system is so slow
Parts of Magento use an EAV database system implemented on top of MySQL. This means querying for a single "thing" often means querying multiple rows
There's a lot of t...
程序员用数据思维教你如何追女生 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...你的事情的时候，你就要小心了。缺陷记录，跟踪和及时修改反馈，让女生知道你在积极为她改变。
单身狗为什么一直单身，是因为他们没有产品思维，一直觉得自己是最傲娇的，老子为什么要为TA改变？所以咯~
对心爱的人...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... opt_copy;
if (len > 0xFFFF) //长度不能超过64k， UDP头部只有16位长度位
return -EMSGSIZE;
/*
* Check the flags.
*/
if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */
return -EOPNOTSUPP;
ipc.opt = NULL;
ipc.tx_flags = 0;
ipc.ttl = 0;
ipc...
完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题 - 更多...
...comment、mood相关的表中catid没有更新。
解决方法：只需修改一个文件搞定 phpcms/modules/content/content.php
/**
* 批量移动文章
*/
public function remove() {...
改为：
/**
* 批量移动文章
*/
publi...