From: botp <botpena@...>
Date: 2011-03-19T01:13:16+09:00
Subject: Re: Array range values assignment

On Fri, Mar 18, 2011 at 11:31 PM, Jeremy Bopp <jeremy@bopp.net> wrote:
> On 3/18/2011 10:22, Ruby Fan wrote:
>> Found way:
>>
>> b = []
>> a[3...7].size.times do b.push("B") end
>> a[3...7] = b
>>
> 3...7.each { |i| a[i] = "B" }
>
> class Array
>  def replace_range_with(range, replacement)
>    range.each { |i| self[i] = replacement }
>    self
>  end
> end
> a = ["A", "A", "A", "A", "A"]
> a.replace_range_with(2...4, "B") #=> ["A", "A", "B", "B", "A"]

in some cases, specifying the starting and  the length may be also handy, eg,

a=["A"]*10
#=> ["A", "A", "A", "A", "A", "A", "A", "A", "A", "A"]

a[3,4]=["B"]*4
#=> ["B", "B", "B", "B"]

a
#=> ["A", "A", "A", "B", "B", "B", "B", "A", "A", "A"]

and ff jeremy's wrapping,

class Array
def replacex start,length, item
  self[start,length]=[item]*length
end
end
#=> nil

a=["A"]*10
#=> ["A", "A", "A", "A", "A", "A", "A", "A", "A", "A"]

a.replacex  3, 4,"B"
#=> ["B", "B", "B", "B"]

a
#=> ["A", "A", "A", "B", "B", "B", "B", "A", "A", "A"]


best regards -botp