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Ruby, 22 bytes ->{(1.._2).reduce &_1} Try this online! Without using reduce (28 bytes): f=->g,n{n<2?n:g[n,f[g,n-1]]} Try this online!
Answer
#1: Initial revision
by
radarek
·
2022-01-08T11:29:30Z (almost 3 years ago)
# [Ruby](https://www.ruby-lang.org/), 22 bytes
```ruby
->{(1.._2).reduce &_1}
```
**[Try this online!](https://ato.pxeger.com/run?1=m72kqDSpcsHiNNuYpaUlaboW23TtqjUM9fTijTT1ilJTSpNTFdTiDWshkjfVC0pLihXSooGK4g21441qdUxiuZDFtEBiprEQ5QsWQGgA)**
Without using `reduce` (28 bytes):
```ruby
f=->g,n{n<2?n:g[n,f[g,n-1]]}
```
**[Try this online!](https://ato.pxeger.com/run?1=m72kqDSpcsGCpaUlaboWe9Jsde3SdfKq82yM7POs0qPzdNKigXxdw9jYWoiSm-oFpSXFCmnRunbV8Yba8Ua1OiaxXMhiWiAx01iIcpjJAA)**