From: Robert Klemme <bob.news@...>
Date: 2004-12-07T23:12:32+09:00
Subject: Re: Idiom for creating hash from two arrays


"Jonathan Paisley" <jp-www@dcs.gla.ac.uk> schrieb im Newsbeitrag
news:pan.2004.12.07.13.40.03.395907@dcs.gla.ac.uk...
> Hello all,
>
> I'm currently using the following code for creating a hash from two
arrays,
> where one array contains keys and the other the corresponding values:
>
>   keys = ['one','two','three']
>   values = [1,2,3]
>
>   h = Hash[*keys.zip(values).flatten]
>   #=> {"three"=>3, "two"=>2, "one"=>1}
>
> Can anyone suggest a better way of doing this? I'm slightly put off
> by the many steps involved in my present solution.

Here are some others - but IMHO your solution is much nicer:

>> keys = ['one','two','three']
=> ["one", "two", "three"]
>> values = [1,2,3]
=> [1, 2, 3]
>> h={}
=> {}
>> keys.each_with_index {|e,i| h[e]=values[i]}
=> ["one", "two", "three"]
>> h
=> {"three"=>3, "two"=>2, "one"=>1}
>> keys = ['one','two','three']
=> ["one", "two", "three"]
>> values = [1,2,3]
=> [1, 2, 3]
>> h={}
=> {}
>> keys.inject(values) do |v,k|
?>   h[k]=v.shift
>>   v
>> end
=> []
>> h
=> {"three"=>3, "two"=>2, "one"=>1}
>>

Kind regards

    robert