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App Inventor 2 数学代码块 · App Inventor 2 中文网
... 隐私策略和使用条款 技术支持 service@fun123.cn
Error: The 'brew link' step did not complete successfully
...ode_modules/npm and then brew link node. This removes the standalone self-hosted npm package (rather than the one brew would like to install) and lets brew symlink its bundled one from Cellar.
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A JRE or JDK must be available in order to run Eclipse. No JVM was found after searching the followi
...nstaller continued and also Eclipse was able to start flawlessly without those two lines in eclipse.ini.
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Detect if Android device has Internet connection
...User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
Log.e(LOG_TAG, "Error checking internet connectio...
Haskell: Converting Int to String
...an Int, use:
module Lib
( someFunc
) where
someFunc :: IO ()
x = 123
someFunc = putStrLn (show x)
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How to change the type of a field?
...now how you'd convert a string (think currency like '1.23') to the integer 123? I assume you'd have to parse it as a float or decimal, multiply it by 100, then save it as an integer, but I can't find the right docs to do this. Thanks!
– Brian Armstrong
Feb 23...
How to check if a process id (PID) exists
...kill to just check if a signal could be sent to the process, which is for most purposes more or less equivalent to checking if it exists. See linux.die.net/man/2/kill and linux.die.net/man/7/signal
– Christoffer Hammarström
Jun 15 '10 at 10:58
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Test if string is a number in Ruby on Rails
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\Z allows to have \n at the end of the string, so "123\n" will pass validation, regardless that it's not fully numeric. But if you use \z then it will be more correct regexp: /\A\d+\z/
– SunnyMagadan
Aug 14 '17 at 9:14
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Basic HTTP authentication with Node and Express 4
...xpress-basic-auth');
app.use(basicAuth({
users: { admin: 'supersecret123' },
challenge: true // <--- needed to actually show the login dialog!
}));
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Can an Option in a Select tag carry multiple values?
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one option is to put multi value with comma seperated
like
value ="123,1234"
and in the server side separate them
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