Comments on Cumulative Counts
Parent
Cumulative Counts
Challenge
Given an array of numbers return the cumulative count of each item.
This is the number of times an item has occurred so far.
Examples
[1,1,2,2,2,1,1,1,3,3] -> [1,2,1,2,3,3,4,5,1,2]
[3,7,5,4,9,2,3,2,6,6] -> [1,1,1,1,1,1,2,2,1,2]
Brownie points for beating my 7 byte APL answer.
BQN, 5 bytes ``` 1+⊒ ``` T …
3y ago
[APL (Dyalog Unicode)], 11 byt …
3y ago
[Jelly], 4 bytes ¹Ƥċ" …
3y ago
Japt, 14 11 8 bytes £¯Y …
3y ago
[APL (Dyalog Unicode)], 11 7 b …
3y ago
[Ruby], 36 bytes ```ruby - …
3y ago
[JavaScript (Node.js)], 34 29 …
2y ago
[Husk], 4 bytes Sz#ḣ …
3y ago
Scala 3, 50 44 bytes ```scala …
3y ago
[Jelly], 7 bytes =þ`ÄŒD …
3y ago
Haskell + hgl, 10 bytes ``` …
1y ago
Python 3, 70 bytes ```pytho …
2y ago
Factor, 122 bytes ``` USIN …
2y ago
Vyxal, 4 bytes ``` KƛtO ``` …
2y ago
[Python 3], 74 bytes …
2y ago
[Python 3.8 (pre-release)], 69 …
2y ago
J, 9 bytes ```J 1#.]=&><\ …
2y ago
J, 24 char ```([: +/ [: ( …
2y ago
Ruby, 31 bytes ```ruby ->a …
2y ago
Post
JavaScript (Node.js), 34 29 26 bytes
-5 bytes thanks to Shaggy's suggestion on a similar challenge
-3 bytes again thanks to Shaggy!
a=>a.map(d=v=>d[v]=-~d[v])
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