[ruby-core:121728] [Ruby Feature#21284] Request: add `Array#pad` method

Issue #21284 has been updated by nobu (Nobuyoshi Nakada).


It may be possible with `Array#fill` and start-exclusive range?

```ruby
ary.fill(object, -1^..padding_length)
```

----------------------------------------
Feature #21284: Request: add `Array#pad` method
https://bugs.ruby-lang.org/issues/21284#change-112780

* Author: MatzFan (Brian Cohen)
* Status: Open
----------------------------------------
A method to pad an array of arbitrary length with objects up to a specified array size does not currently exist.

`Array#fill` does not do this and I therefore propose the following method:

``` ruby
class Array
  def pad(pad_to_length, object = nil)
    fill(object, size, pad_to_length - size)
  end
end
```

I have provided an [answer](https://stackoverflow.com/a/79591610/4114896) to a Stack Overflow question asking how this can be done in Ruby. I've also explained in a comment on the answer which suggests using `Array#fill` why this does not meet the exact need.



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