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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...工作
APPINVENTOR测试平台：AppInventor2中文网（https://www.fun123.cn）
MQTT拓展下载：MQTT中文文档页面进行下载。
MQTT测试平台：
中文平台推荐：bemfa.com 界面简洁，对入门者友好。当然也可以选择稍复杂...
Eclipse reports rendering library more recent than ADT plug-in
...Install New Software.
In the Work with field, enter: https://dl-ssl.google.com/android/eclipse/
Select Developer Tools / Android Development Tools.
Click Next and complete the wizard.
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impro...
Matching an empty input box using CSS
... this answer should not be the top one. see the answer below stackoverflow.com/a/35593489/11293716
– sijanec
May 30 at 18:38
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'heroku' does not appear to be a git repository
...tory with a valid package.json and .git folder, as told here stackoverflow.com/questions/38658038/…
– Junior Mayhé
Jul 31 '17 at 17:56
1
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Multi-key dictionary in c#? [duplicate]
...y run into scalability issues.
Also, you get to avoid nulls which tend to complicate matters (and if you really want nulls, you just make your Tuple<> nullable). Slightly offtopic, am I the only one annoyed at the framework-level lack of support for non-null references? I work on large proj...
Open files in 'rt' and 'wt' modes
...nctions generally wrap the fopen function which is described here:
http://www.cplusplus.com/reference/cstdio/fopen/
As you can see it mentions the use of b to open the file in binary mode.
The document link you provided also makes reference to this b mode:
Appending 'b' is useful even on systems...
In node.JS how can I get the path of a module I have loaded via require that is *not* mine (i.e. in
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How do you round to 1 decimal place in Javascript?
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If you use Math.round(5.01) you will get 5 instead of 5.0.
If you use toFixed you run into rounding issues.
If you want the best of both worlds combine the two:
(Math.round(5.01 * 10) / 10).toFixed(1)
You might want to create a function for thi...
How to use RSpec's should_raise with any kind of exception?
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Note: raise_error is an alias for raise_exception.
Documentation: https://www.relishapp.com/rspec
RSpec 2:
https://www.relishapp.com/rspec/rspec-expectations/v/2-13/docs/built-in-matchers/raise-error-matcher
RSpec 1:
http://apidock.com/rspec/Spec/Matchers/raise_error
http://apidock.com/rspec/Spe...
Prepend text to beginning of string
...developers who got used to tricks used in other languages, here are tests, comparing this to other solutions: jsperf.com/prepend-text-to-string/5
– metalim
Apr 22 '19 at 11:25
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