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How is this fibonacci-function memoized?
... and kept ready in case it is asked for again. If we define some list, xs=[0..] and later ask for its 100th element, xs!!99, the 100th slot in the list gets "fleshed out", holding the number 99 now, ready for next access.
That is what that trick, "going-through-a-list", is exploiting. In normal do...
Why is arr = [] faster than arr = new Array?
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answered Sep 10 '11 at 23:51
Roger PoonRoger Poon
2,63511 gold badge1313 silver badges1111 bronze badges
...
Add st, nd, rd and th (ordinal) suffix to a number
... '14) accomplishes this:
function ordinal_suffix_of(i) {
var j = i % 10,
k = i % 100;
if (j == 1 && k != 11) {
return i + "st";
}
if (j == 2 && k != 12) {
return i + "nd";
}
if (j == 3 && k != 13) {
return i + "rd";
...
Python argparse: default value or specified value
...example=1)
% test.py --example 2
Namespace(example=2)
nargs='?' means 0-or-1 arguments
const=1 sets the default when there are 0 arguments
type=int converts the argument to int
If you want test.py to set example to 1 even if no --example is specified, then include default=1. That is, with
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How can I return an empty IEnumerable?
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answered Jul 12 '10 at 15:24
Michael MrozekMichael Mrozek
141k2424 gold badges151151 silver badges159159 bronze badges
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Using usort in php with a class private function
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230
Make your sort function static:
private static function merchantSort($a,$b) {
return ......
How can you encode a string to Base64 in JavaScript?
... character represents an 8-bit byte – that is, its value will be between 0 and 0xff. This does not mean it’s ASCII – presumably if you’re using this function at all, you expect to be working with binary data and not text.
See also:
How do I load binary image data using Javascript and XML...
How to uncompress a tar.gz in another directory
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edited Mar 7 '16 at 10:26
answered Aug 23 '13 at 12:19
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What is sys.maxint in Python 3?
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180
The sys.maxint constant was removed, since there is no longer a limit
to the value of integ...
Object.getOwnPropertyNames vs Object.keys
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edited Jul 20 at 18:26
Scott Enock
611010 bronze badges
answered Mar 26 '14 at 10:47
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