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Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
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Here's a comment by React team member Sebastian Markbåge which sheds some light:
React does the diffing on the output (which is a known serializable format, DOM attributes). This means that the source data can be of any format. It can be immutable data structures and state in...
Where does this come from: -*- coding: utf-8 -*-
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actually, if I put a line like test1 = 'äöü' it will hint you to add such a headder to the file. (pycharm 2019.1)
– Cutton Eye
Sep 27 '19 at 10:33
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Retrieving the last record in each group - MySQL
There is a table messages that contains data as shown below:
27 Answers
27
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How to impose maxlength on textArea in HTML using JavaScript
...ise the browser will enforce the limit).
– Juha Palomäki
Jan 20 '13 at 23:16
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JMS Topic vs Queues
... Some JMS providers efficiently choose to implement this as UDP instead of TCP. For topic's the message delivery is 'fire-and-forget' - if no one listens, the message just disappears. If that's not what you want, you can use 'durable subscriptions'.
A JMS queue is a 1-to-1 destination of messages. ...
How to create a bash script to check the SSH connection?
... ssh | grep open`
$ b=`nmap downhost -PN -p ssh | grep open`
$ echo $a
22/tcp open ssh
$ echo $b
(empty string)
But you'll have to grep the message (nmap does not use the return-value to show if a port was filtered, closed or open).
EDIT2:
If you're interested in the actual state of the ssh-por...
Can you configure log4net in code instead of using a config file?
... setting hierarchy.Configured = true;.
– Eivind Gussiås Løkseth
Apr 5 '17 at 14:49
3
Make sure ...
Launching Spring application Address already in use
...| grep LISTEN
java 78960 xyxss 119u IPv6 0x6c20d372bc88c27d 0t0 TCP *:8092 (LISTEN)
The 78960 is the process id, use the following command to kill the process
kill -9 78960
Launch the application again.
share...
ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
...the unix socket (/var/run/mysqld/mysqld.sock on ubuntu) rather than over a TCP socket.
– Duke
Sep 12 '13 at 0:08
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Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...据，心里有个底。
测试前提
Redis version 2.4.2
Using the TCP loopback
Payload size = 256 bytes
测试结果
SET: 198412.69/s
GET: 198019.80/s
这个数据刚一看觉得有点超出预期了，不过看了测试前提是规避了网络开销的，Client 和 Server 全在本机...