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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
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在 App Inventor 2 中使用图像，避免一些常见的陷阱！
Out of memory errors
An example of misusing large images
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How to show current year in view?
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249
<%= Time.current.year %>
http://pleac.sourceforge.net/pleac_ruby/datesandtimes.html
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Regular expression for exact match of a string
...tch two passwords with regular expression. For example I have two inputs "123456" and "1234567" then the result should be not match (false). And when I have entered "123456" and "123456" then the result should be match (true).
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Ruby on Rails: How can I revert a migration with rake db:migrate?
...nt to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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Why is XOR the default way to combine hashes?
...bit) inputs, the AND function output probability distribution is 75% 0 and 25% 1. Conversely, OR is 25% 0 and 75% 1.
The XOR function is 50% 0 and 50% 1, therefore it is good for combining uniform probability distributions.
This can be seen by writing out truth tables:
a | b | a AND b
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C: What is the difference between ++i and i++?
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21 Answers
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Which is generally best to use — StringComparison.OrdinalIgnoreCase or StringComparison.InvariantCul
...ion.
From MSDN's "New Recommendations for Using Strings in Microsoft .NET 2.0"
Summary: Code owners previously using the InvariantCulture for string comparison, casing, and sorting should strongly consider using a new set of String overloads in Microsoft .NET 2.0. Specifically, data that is des...
Can code that is valid in both C and C++ produce different behavior when compiled in each language?
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answered Oct 14 '12 at 23:57
Alexey FrunzeAlexey Frunze
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