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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
...米/英寸）
红外传感器
接收红外遥控器消息
触碰传感器
二进制按下/释放状态
陀螺仪传感器
旋转运动数据（±3°精度，最大440°/秒）
硬件要求
LEGO Min...
Where to find extensions installed folder for Google Chrome on Mac?
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On chrome 80xx, MacOS 10.15.3 --> /Users/xxxxxxx/Library/Application Support/Google/Chrome/Profile 1/Extensions/
– sunnyuff
Mar 31 at 19:21
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Remove all occurrences of char from string
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will work.
Usage would be str.replace("X", "");.
Executing
"Xlakjsdf Xxx".replaceAll("X", "");
returns:
lakjsdf xx
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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...的Result里面用isSuccess表示是否执行成功，如果失败则错误消息通过errorMessage返回；用泛型解决了Object强制转换的问题，。
当然，后来我用了异常。因为我觉得没有正常人喜欢用if来不停的判断，看起来就像C语言一样“二”。函...
Extract a regular expression match
...syntax and adds a few that are missing:
library(stringr)
str_locate("aaa12xxx", "[0-9]+")
# start end
# [1,] 4 5
str_extract("aaa12xxx", "[0-9]+")
# [1] "12"
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How can I add a vertical scrollbar to my div automatically?
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You can set :
overflow-y: scroll;height: XX px
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Multiplication on command line terminal
...he trick of interpreting '5X5'
$ function calc { bc -l <<< ${@//[xX]/*}; };
$ calc 5X5
25
$ calc 5x5
25
$ calc '5*5'
25
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What does PermGen actually stand for?
...n is used by the JVM to hold loaded classes. You can increase it using:
-XX:MaxPermSize=384m
if you're using the Sun JVM or OpenJDK.
So if you get an OutOfMemoryException: PermGen you need to either make PermGen bigger or you might be having class loader problems.
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Logstash实践: 分布式系统的日志监控 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Redis的队列数据结构。两者都可以用来实现系统间有序的消息异步通信。channel相比list的好处是，解除了发布者和订阅者之间的耦合。举个例子，一个Indexer在持续读取Redis中的记录，现在想加入第二个Indexer，如果使用list，就会出...
Count number of occurrences of a pattern in a file (even on same line)
...regex to span \n-delimited lines (if you need it).
printf 'X \n moo X\n XX\n' |
awk -vRS='X[^X]*X' 'END{print (NR<2?0:NR-1)}'
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