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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
...votesRef.transaction(function (current_value) {
return (current_value || 0) + 1;
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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 JavaSc...
How to find and return a duplicate value in array
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Where in a virtualenv does the custom code go?
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virtualenv provides a python interpreter instance, not an application instance. You wouldn't no...
Generating Random Passwords
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answered Sep 10 '08 at 22:44
RikRik
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setuptools vs. distutils: why is distutils still a thing?
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+50
Have a look at this SO question. It explains all the packaging methods very well, and might help answer your question to some extent: ...
Convert between UIImage and Base64 string
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let imageData:NSData = NSData.init(contentsOfURL: url)!
Swift 2.0 > Encoding
let strBase64:String = imageData.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
Swift 2.0 > Decoding
let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64Dec...
What do 'statically linked' and 'dynamically linked' mean?
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450
There are (in most cases, discounting interpreted code) two stages in getting from source code (...
What Haskell representation is recommended for 2D, unboxed pixel arrays with millions of pixels?
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edited Jun 17 '13 at 2:20
icktoofay
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App Inventor 2 低功耗蓝牙 BlueToothLE 拓展 · App Inventor 2 中文网
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最新版拓展下载：
edu.mit.appinventor.ble-20230728.aix
低功耗蓝牙，也称为蓝牙LE 或简称 BLE，是一种类似于经典蓝牙的新通信协议，不同之处在于它旨在消耗更少的功耗和成本，同时保持同等的功能。
因此，低功耗...
The written versions of the logical operators
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answered Mar 4 '10 at 2:11
GManNickGGManNickG
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