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Ruby, 36 bytes ->a{i=-1;a.map{a[0..i+=1].count _1}} Try it online! The code in the TIO link is 2 bytes longer because _n block parameter names are not supported on TIO's Ruby instance yet. ...
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#1: Initial revision
by
snail_
·
2021-07-29T08:23:52Z (over 3 years ago)
# [Ruby], 36 bytes
```ruby
->a{i=-1;a.map{a[0..i+=1].count _1}}
```
[Try it online!][TIO-kron0uvq]
The code in the TIO link is 2 bytes longer because `_n` block parameter names are not supported on TIO's Ruby instance yet. It will work the same, however. The code is:
```ruby
->a{i=-1;a.map{a[0..i+=1].count a[i]}}
```
[Ruby]: https://www.ruby-lang.org/
[TIO-kron0uvq]: https://tio.run/##TU67CgIxEOzvKxZtFNdg7nygEsFGECwEyyNF1BwG1Mg9Con59nMTEWUIzM7sTLZsjs@2EO1wpZwRQ75U7KYeTuUjxsxAcMlOtrnXoHIjvW9rXdUVCHAJQM6RYxrBIzLMJIhVMNJokYBjnAQuMSQynNE4xnk0U5zi9Jv44VOYysQn8Tum1ekCZwsvg2Bf1FPSBQXrmT7xR0MHdbrOeAhN0HXWd0g3RVgTYIl/t/brwyF4@lrpP3mz3u4WIVnGpL6fE3rtGw "Ruby – Try It Online"