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Error while installing json gem 'mkmf.rb can't find header files for ruby'
...ll ruby2.0-dev
sudo apt-get install ruby2.2-dev
sudo apt-get install ruby2.3-dev
or, generic way:
sudo apt-get install ruby-dev
or
sudo apt-get install ruby`ruby -e 'puts RUBY_VERSION[/\d+\.\d+/]'`-dev
The first link you’ve posted is exactly your case: there is no ruby development...
What is the difference between visibility:hidden and display:none?
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edited Feb 12 '16 at 13:29
Casimir Crystal
17.4k1111 gold badges5252 silver badges7676 bronze badges
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MySql : Grant read only options?
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163
If there is any single privilege that stands for ALL READ operations on database.
It depend...
how to break the _.each function in underscore.js
...s, you could do something convoluted like this (link to JSFiddle):
[1, 2, 3, 4].every(function(n) {
alert(n);
return n !== 3;
});
This will alert 1 through 3, and then "break" out of the loop.
You're using underscore.js, so you'll be pleased to learn that it does provide an every method...
How to join two generators in Python?
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answered Jul 9 '10 at 8:30
PhilippPhilipp
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How to remove item from list in C#?
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373
List<T> has two methods you can use.
RemoveAt(int index) can be used if you know the i...
Best way to parseDouble with comma as decimal separator?
... NumberFormat.getInstance(Locale.FRANCE);
Number number = format.parse("1,234");
double d = number.doubleValue();
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Doing a cleanup action just before Node.js exits
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531
UPDATE:
You can register a handler for process.on('exit') and in any other case(SIGINT or unha...
Programmatically align a toolbar on top of the iPhone keyboard
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As of iOS 3.2 there's a new way to achieve this effect:
UITextFields and UITextViews have an inputAccessoryView property, which you can set to any view, that is automatically displayed above and animated with the keyboard.
Note that ...
How do I get the day of week given a date?
...rt datetime
>>> datetime.datetime.today()
datetime.datetime(2012, 3, 23, 23, 24, 55, 173504)
>>> datetime.datetime.today().weekday()
4
From the documentation:
Return the day of the week as an integer, where Monday is 0 and Sunday is 6.
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