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Ternary operator (?:) in Bash
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ternary operator ? : is just short form of if/else
case "$b" in
5) a=$c ;;
*) a=$d ;;
esac
Or
[[ $b = 5 ]] && a="$c" || a="$d"
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When is finally run if you throw an exception from the catch block?
...lock is executed)
editing this 7 years later - one important note is that if e is not caught by a try/catch block further up the call stack or handled by a global exception handler, then the finally block may never execute at all.
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How to tell if node.js is installed or not
...ind further instructions. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such:
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Physical vs. logical / soft delete of database record?
...de any reporting/display methods to take the flag into account.
As far as if it is a common practice - I would say yes, but as with anything whether you use it depends on your business needs.
EDIT: Thought of another disadvantange - If you have unique indexes on the table, deleted records will sti...
Getting MAC Address
...module can be used and the only method under Linux I could find was to run ifconfig and run a regex across its output. I don't like using a package that only works on one OS, and parsing the output of another program doesn't seem very elegant not to mention error prone.
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What is the difference between NULL, '\0' and 0?
In C, there appear to be differences between various values of zero -- NULL , NUL and 0 .
11 Answers
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Determining if a variable is within range?
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if i.between?(1, 10)
do thing 1
elsif i.between?(11,20)
do thing 2
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std::find，std::find_if使用小结 - C/C++ - 清泛网 - 专注C/C++及内核技术
std::find，std::find_if使用小结STL的find，find_if函数提供了一种对数组、STL容器进行查找的方法。使用该函数，需 #include <algorithm>我们查找一个list中的数据，通常...STL的find，find_if函数提供了一种对数组、STL容器进行查找的方法。使...
How to debug a GLSL shader?
...ally distinctive to the screen. For example you can paint something a specific color only if you reach the point of your code where you want add a printf. If you need to printf a value you can set the color according to that value.
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How to determine if a record is just created or updated in after_save
The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update?
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