From: James Gray <james@...>
Date: 2009-07-02T21:51:28+09:00
Subject: Re: delete_if_with_index or delete_at(array) in 1.8.6?

On Jul 2, 2009, at 7:20 AM, Bil Kleb wrote:

> Given an array of integers, I need to delete all those
> entries that are lower than the current array index.

> Anything more elegant available?
>
> Or perhaps an alternative way to attack the problem?

On Ruby 1.9, your very first example can almost be made to work as is:

   >> a = Array.new(10) { |i| i + [-1, 0, 1][rand(3)] }
   => [-1, 1, 2, 4, 3, 5, 7, 7, 9, 10]
   >> a.delete_if.with_index { |e, i| e < i }
   => [1, 2, 4, 5, 7, 7, 9, 10]

James Edward Gray II