Issue #20176 has been updated by Eregon (Benoit Daloze). I don't think this could be implemented more efficiently than doing `buffer.insert offset, array.pack(format)`. Notably because in general the length of the produced string is unknown before packing. So then I think this is not worth adding. ---------------------------------------- Feature #20176: Array#pack: support offset kwarg https://bugs.ruby-lang.org/issues/20176#change-106158 * Author: chucke (Tiago Cardoso) * Status: Open * Priority: Normal ---------------------------------------- I was changing some code to use ruby 3.3's new `buffer` kwarg (great addition btw!) when using `Array#pack`. There are a few cases however, where I could perform the change, as not all my usages rely on appending; in some, I'm actually prepending it. To solve this, I'd like to propose the `offset` kwarg, which declares where to add the resulting string. picking up on example from the docs: [65, 66].pack('C*', buffer: 'foo') # => "fooAB" [65, 66].pack('C*', buffer: 'foo', offset: 0) # => "ABfoo" [65, 66].pack('C*', buffer: 'foo', offset: 1) # => "fABoo" -- https://bugs.ruby-lang.org/