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What is the !! (not not) operator in JavaScript?
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Converts Object to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject // inverted boolean
!!oObject // non inverted boolean so true boolean representation
So !! is not an operator, it's just the ! operator twice.
Real W...
Empty Visual Studio Project?
Is there a way to have an empty Project in Visual Studio 2008 or 2010? I do not mean an empty solution, I mean an empty project in a solution. Basically I have a solution with multiple projects, and I want to add a project to track some static files that are part of the solution but not of any speci...
Remove underline from links in TextView - Android
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220
+50
You can d...
MySQL Query GROUP BY day / month / year
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1038
GROUP BY YEAR(record_date), MONTH(record_date)
Check out the date and time functions in MySQ...
How do I adb pull ALL files of a folder present in SD Card
...e2.jpg
pull: /sdcard/Folder1/image3.jpg -> ./image3.jpg
3 files pulled. 0 files skipped.
Specific Files/Folders using find from BusyBox:
adb shell find "/sdcard/Folder1" -iname "*.jpg" | tr -d '\015' | while read line; do adb pull "$line"; done;
Here is an explanation:
adb shell find "/sdca...
Redis command to get all available keys?
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answered Mar 9 '11 at 21:40
yojimbo87yojimbo87
57.1k2121 gold badges118118 silver badges128128 bronze badges
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What is the best way to tell if a character is a letter or number in Java without using regexes?
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answered Oct 28 '10 at 23:06
AdamAdam
37.3k1515 gold badges9797 silver badges134134 bronze badges
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Spark java.lang.OutOfMemoryError: Java heap space
...uge amounts of data you may need way more than 4 per CPU, I've had to use 8000 partitions in some cases!
Decrease the fraction of memory reserved for caching, using spark.storage.memoryFraction. If you don't use cache() or persist in your code, this might as well be 0. It's default is 0.6, which me...
Rails respond_with: how does it work?
...rd-party responders gem as of Rails 4.2 (release notes / commit dated Aug 2014). While responders is not included in Rails by default, it is a dependency of Devise, and thus available in many Rails applications.
The #respond_to instance method, however, is still a part of Rails (5.2rc1 as of this w...
GIF Animated 扩展：可点击透明背景动画GIF播放器 · App Inventor 2 中文网
...并支持透明背景。
包名：com.KIO4_AniGif.aix / com.KIO4_AniGif10.aix（Android 10+）
技术基础：基于 GifDecoder.java 开发，包含大量修改
最后更新：2022年6月21日
下载链接
扩展文件需从外部网站获取：
com.KIO4_AniGif.aix
p193A3_...