From: "MatzFan (Brian Cohen) via ruby-core" <ruby-core@...>
Date: 2025-04-25T07:35:25+00:00
Subject: [ruby-core:121729] [Ruby Feature#21284] Request: add `Array#pad` method

Issue #21284 has been updated by MatzFan (Brian Cohen).


When I try and run that code, e.g.
``` ruby
[1, 2, 3].fill(nil, -1^..10)
```


``` shell
'Integer#^': Range can't be coerced into Integer (TypeError)
```
In any case `pad(10)` is much prettier IMHO.


----------------------------------------
Feature #21284: Request: add `Array#pad` method
https://bugs.ruby-lang.org/issues/21284#change-112781

* 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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