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AI2 如何快捷比较两个列表的差异项，然后再根据差异的项去执行更新操作？ -...
有会员提问，如题。目前TA采用的方案是：遍历2个列表全部执行一遍，程序很卡！
解决思路：
这时，我们就会考虑使用字典来解决这个性能问题了，回顾一下文档中字典的特点：
https://www.fun123.cn/reference/blocks/dictionaries.html
Q...
appinventor2开发出来的App，可以申请软著和发明专利吗？ - App Inventor 2...
用App Inventor 2开发的App可以申请软件著作权（软著），但申请发明专利可能会比较困难，具体情况如下：
1. 软件著作权（软著）可申请：
App Inventor 2生成的应用程序，其源代码和界面设计由开发者创作，符合著作权法中的“作...
how to schedule a job for sql query to run daily?
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edited Sep 17 '12 at 15:34
Avada Kedavra
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PHP Fatal error: Cannot redeclare class
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answered Apr 2 '09 at 3:15
whichdanwhichdan
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In Ruby, is there an Array method that combines 'select' and 'map'?
...ia as a postfix if. compact gets rid of the nils.
jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1}
=> [3, 3, 3, nil, nil, nil]
jruby-1.5.0 > [1,1,1,2,3,4].map{|n| n*3 if n==1}.compact
=> [3, 3, 3]
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Bash script to receive and repass quoted parameters
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What is the use of a private static variable in Java?
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Of course it can be accessed as ClassName.var_name, but only from inside the class in which it i...
undefined reference to `__android_log_print'
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edited Jun 4 '13 at 12:57
Tim Cooper
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a...
How to detect Safari, Chrome, IE, Firefox and Opera browser?
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