Reverse `...` method Ruby

Question

Is there a standard method in ruby similar to `(1...4).to_a` is `[1,2,3,4]` except reverse i.e. `(4...1).to_a` would be `[4,3,2,1]`? I realize this can easily be defined via `(1...4).to_a.reverse` but it strikes me as odd that it is not already and 1) am I missing something? 2) if not, is there a functional/practical reason it is not already?

Accepted Answer

The easiest is probably this:

```
4.downto(1).to_a #=> [4, 3, 2, 1]
```

Alternatively you can use `step`:

```
4.step(1,-1).to_a #=> [4, 3, 2, 1]
```

Finally a rather obscure solution for fun:

```
(-4..-1).map(&:abs) #=> [4, 3, 2, 1]
```

Reverse `...` method Ruby

Solution

Problem