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How to unset a JavaScript variable?
...hen the target isn't an object property. e.g.,
(function() {
var foo = 123;
delete foo; // wont do anything, foo is still 123
var bar = { foo: 123 };
delete bar.foo; // foo is gone
}());
But since global variables are actually members of the window object, it works.
When prototype c...
Restore the state of std::cout after manipulating it
... {
boost::io::ios_flags_saver ifs(x);
x << std::hex << 123;
}
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REST URI convention - Singular or plural name of resource while creating it
...ll likely error, as this request doesn't make any sense, whereas /resource/123 makes perfect sense.
Using /resource instead of /resources is similar to how you would do this if you were working with, say, a file system and a collection of files and /resource is the "directory" with the individual 1...
How do I create multiple submit buttons for the same form in Rails?
...
Similar solution to one suggested by @vss123 without using any gems:
resources :plan do
post :save, constraints: lambda {|req| req.params.key?(:propose)}, action: :propose
post :save, constraints: lambda {|req| req.params.key?(:finalize)}, action: :finalize
end...
Convert string to integer type in Go?
... fmt.Printf("i=%d, type: %T\n", i, i)
}
Output (if called with argument "123"):
i=123, type: int
i=123, type: int64
i=123, type: int
Parsing Custom strings
There is also a handy fmt.Sscanf() which gives even greater flexibility as with the format string you can specify the number format (like ...
How to print instances of a class using print()?
....it will act the following way in the Python shell:
>>> t = Test(123, 456)
>>> t
<Test a:123 b:456>
>>> print repr(t)
<Test a:123 b:456>
>>> print(t)
From str method of Test: a is 123, b is 456
>>> print(str(t))
From str method of Test: a is ...
How can I pass a list as a command-line argument with argparse?
...'<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
nargs='+' takes 1 or more arguments, nargs='*' takes zero or more.
append
parser.add_argument('-l','--list', action='append', help='<Required> Set flag', required=True)
# Use like:
# python arg.p...
Convert text into number in MySQL query
...
You can use CAST() to convert from string to int. e.g. SELECT CAST('123' AS INTEGER);
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Is there a JavaScript function that can pad a string to get to a determined length?
...
I found this solution here and this is for me much much simpler:
var n = 123
String("00000" + n).slice(-5); // returns 00123
("00000" + n).slice(-5); // returns 00123
(" " + n).slice(-5); // returns " 123" (with two spaces)
And here I made an extension to the string object:
String.prototy...
Alphabet range in Python
... 'y', 'z']
And to do it with range
>>> list(map(chr, range(97, 123))) #or list(map(chr, range(ord('a'), ord('z')+1)))
['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
Other helpful string module features:...