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How to check if object has any properties in JavaScript?
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answered Apr 20 '10 at 6:49
Daniel VassalloDaniel Vassallo
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How do I clone a Django model instance object and save it to the database?
...fficial docs on copying model instances: https://docs.djangoproject.com/en/2.2/topics/db/queries/#copying-model-instances
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How to check whether a given string is valid JSON in Java
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263
A wild idea, try parsing it and catch the exception:
import org.json.*;
public boolean isJSO...
docker mounting volumes on host
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Chris McKinnelChris McKinnel
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Bash syntax error: unexpected end of file
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I think file.sh is with CRLF line terminators.
run
dos2unix file.sh
then the problem will be fixed.
You can install dos2unix in ubuntu with this:
sudo apt-get install dos2unix
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Include headers when using SELECT INTO OUTFILE?
...d code those headers yourself. Something like:
SELECT 'ColName1', 'ColName2', 'ColName3'
UNION ALL
SELECT ColName1, ColName2, ColName3
FROM YourTable
INTO OUTFILE '/path/outfile'
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matplotlib.pyplot will not forget previous plots - how can I flush/refresh?
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2 Answers
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How do I get a human-readable file size in bytes abbreviation using .NET?
...ble len = new FileInfo(filename).Length;
int order = 0;
while (len >= 1024 && order < sizes.Length - 1) {
order++;
len = len/1024;
}
// Adjust the format string to your preferences. For example "{0:0.#}{1}" would
// show a single decimal place, and no space.
string result = St...
In C++, if throw is an expression, what is its type?
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According to the standard, 5.16 paragraph 2 first point, "The second or the third operand (but not both) is a throw-expression (15.1); the result is of the type of the other and is an rvalue." Therefore, the conditional operator doesn't care what type a throw-expres...
编译器内部的秘密--微软的编译器是如何解析Try/Catch/Throw的 - C/C++ - 清...
...的并不一致。原文译自：http://www.codeproject.com/Articles/175482/Compiler-Internals-How-Try-Catch-Throw-are-Interprpreted-by-the-Microsoft-Compiler
引言
开始文章之前，先声明几件重要事情。本文不是一篇介绍如何在x86架构上详细地实现异常处理(exceptio...