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How do I best silence a warning about unused variables?
...
You can put it in "(void)var;" expression (does nothing) so that a compiler sees it is used. This is portable between compilers.
E.g.
void foo(int param1, int param2)
{
(void)param2;
bar(param1);
}
Or,
#define UNUSED(expr) do { (void)(expr); } ...
Calling a Method From a String With the Method's Name in Ruby
... 2, 3]
a.send("length")
# or
a.public_send("length")
which returns 3 as expected
or for a module function
FileUtils.send('pwd')
# or
FileUtils.public_send(:pwd)
and a locally defined method
def load()
puts "load() function was executed."
end
send('load')
# or
public_send('load')
Docum...
What does the caret operator (^) in Python do?
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It's a bitwise XOR (exclusive OR).
It results to true if one (and only one) of the operands (evaluates to) true.
To demonstrate:
>>> 0^0
0
>>> 1^1
0
>>> 1^0
1
>>> 0^1
1
To explain one of your own exa...
How can I list all commits that changed a specific file?
...all commits regarding that filename (not actual file). If you create files X and Y, changed both, then deleted Y and renamed X to Y and then also changed it, and you run git log Y, you will get messages for both old Y and new one. And the opposite, with --follow you will get commits regarding that f...
Are email addresses case sensitive?
...t of e-mail is case sensitive, however I've tried to send e-mail to name@example.com , Name@example.com and NAME@example.com - it has arrived in each case.
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Is there a job scheduler library for node.js? [closed]
... would let me schedule some function to be ran at certain time (15:30 for example, not x hours from now etc)? If there isn't this kind of library how this should be implemented? Should I just set callback to be called every second and check the time and start jobs scheduled for the time or what?
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Why should text files end with a newline?
I assume everyone here is familiar with the adage that all text files should end with a newline. I've known of this "rule" for years but I've always wondered — why?
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Python Empty Generator Function
...rator; it stops iteration without yielding anything, and thus provides an explicit alternative to letting the function run out of scope. So use yield to turn the function into a generator, but precede it with return to terminate the generator before yielding anything.
>>> def f():
... ...
What is the purpose of a question mark after a type (for example: int? myVariable)?
Typically the main use of the question mark is for the conditional, x ? "yes" : "no" .
8 Answers
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Replace a value if null or undefined in JavaScript
...ilter2 = options.filters[1] || ''; // is ''
That can be accessed by index.
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