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What makes Lisp macros so special?
...bleByTwo = [x for x in range(10) if x % 2 == 0]
yields a list containing all even numbers between 0 and 9. Back in the Python 1.5 days there was no such syntax; you'd use something more like this:
divisibleByTwo = []
for x in range( 10 ):
if x % 2 == 0:
divisibleByTwo.append( x )
Thes...
Why are quaternions used for rotations?
... multiplication is much faster than 3x3 matrix multiplication).
Note that all of these representations of rotations are used in practice. Euler angles use the least memory; matrices use more memory but don't suffer from Gimbal lock and have nice analytical properties; and quaternions strike a nice ...
How to select the first element in the dropdown using jquery?
I want to know how to select the first option in all select tags on my page using jquery.
9 Answers
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How to recursively list all the files in a directory in C#?
How to recursively list all the files in a directory and child directories in C#?
22 Answers
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How can I undo git reset --hard HEAD~1?
... I prefer git reflog over git log -g simply because you get all the information on one line with sha1, HEAD info and commit messages all lined up. Much easier to read.
– Snowcrash
Nov 11 '14 at 18:41
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How do I combine a background-image and CSS3 gradient on the same element?
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body {
background: #eb01a5;
background-image: url("IMAGE_URL"); /* fallback */
background-image: url("IMAGE_URL"), linear-gradient(#eb01a5, #d13531); /* W3C */
}
These 2 lines are the fallback for any browser that doesn't do gradients.
See notes for stacking images only IE < 9 ...
Get current value of a setting in Vim
...
If you don't remember what setting you want to check, you can view all settings:
:set all
or show each setting, one setting per line:
:set! all
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Is a statically-typed full Lisp variant possible?
Is a statically-typed full Lisp variant possible? Does it even make sense for something like this to exist? I believe one of a Lisp language's virtues is the simplicity of its definition. Would static typing compromise this core principle?
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Using Mockito with multiple calls to the same method with the same arguments
... This answer helped me a lot because doAnswer()/thenAnswer() do not allow chaining multiple calls as doReturn()/thenReturn() do and I needed to compute something and not just return a different value. Creating an anonymous Answer object with a private count variable was what did the trick for...
Is using Random and OrderBy a good shuffle algorithm?
...asy to implement an O(n) shuffle. The code in the question "works" by basically giving a random (hopefully unique!) number to each element, then ordering the elements according to that number.
I prefer Durstenfield's variant of the Fisher-Yates shuffle which swaps elements.
Implementing a simple S...