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What's the (hidden) cost of Scala's lazy val?
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edited Feb 20 '14 at 20:33
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Python: print a generator expression?
...for example:
>>> sorted(x*x for x in range(10))
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]
Basically all the other comprehensions available in Python 3 and Python 2.7 is just syntactic sugar around a generator expression. Set comprehensions:
>>> {x*x for x in range(10)}
{0, 1, 4, 81,...
Copying files using rsync from remote server to local machine
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2 Answers
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Transparent background with three.js
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If you want a transparent background in three.js, you need pass in the alpha parameter to the ...
Difference between del, remove and pop on lists
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The effects of the three different methods to remove an element from a list:
remove removes the...
Python OpenCV2 (cv2) wrapper to get image size?
How to get the size of an image in cv2 wrapper in Python OpenCV (numpy). Is there a correct way to do that other than numpy.shape() . How can I get it in these format dimensions: (width, height) list?
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Two sets of parentheses after function call
...as looking how filters works in Angularjs and I saw that we need to send 2 sets of parentheses.
3 Answers
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Difference between Document-based and Key/Value-based databases?
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Postgresql aggregate array
...nt name on GROUP BY.
CREATE TABLE grade
(Student_id int, Mark varchar(2));
INSERT INTO grade
(Student_id, Mark)
VALUES
(1, 'A'),
(2, 'B'),
(2, 'B+'),
(3, 'C'),
(3, 'A');
CREATE TABLE student
(Id int primary key, Name varchar(5));
INSERT INTO student
(Id, Name...