From: Robert Klemme <shortcutter@...>
Date: 2008-08-01T22:15:15+09:00
Subject: Re: Using array.select with grep

2008/8/1 Milo Thurston <knirirr@gmail.com>:

> Before anyone asks, I'm not using  the array intersecttion (arr1 & arr2)
> because I am testing this expression prior to using it to find objects
> in an array (arr1) where an object parameter is found in an array of
> strings (arr2), e.g. to find all people from the array of people objects
> whose first name is in a list of names:
>
> arr1.select { |y| arr2.grep(y.string_of_interest) }
>
> Although if there's a better way of doing that I'd be interested to
> know.

Just one additional remark: if your Arrays grow large you might
benefit from converting them to Set which has faster lookups.

Kind regards

robert


-- 
use.inject do |as, often| as.you_can - without end