From: Shannon Fang <xrfang@...>
Date: 2005-10-25T13:52:07+09:00
Subject: Re: RCR: Array#to_h

>I think the proposal is over specialized. Why should the array elements
>neccessarily become keys?

This is actually the useful feature! I already said not everybody need it... 
However, I don't see any need to map array key to hash key:

a = [1, 2, 3, 4, 5]
b = {1, 2, 3, 4, 5}

a[0] = 1
b[0] = 1

why we need to convert a to b?? The reason to use a hash is for fast access, 
not by using sequential index!

Shannon


>
>Nobu, I agree except 1) key,value in Enumerable? 2) other clearly
>polymorphic solution:
>
>module Enumerable
>   def to_h
>     hash = {}
>     each_with_index {|value,index| hash[i] = value}
>     hash
>   end
>end
>
>Hence hash key <-> array index. And it is by definition "Enumerable".
>
>T.
>
>