From: Mikel Lindsaar <raasdnil@...>
Date: 2008-07-07T15:23:19+09:00
Subject: Re: Find matching elements in array

On Mon, Jul 7, 2008 at 4:04 PM, Pragash Mr.
<gananapragasam@srishtisoft.com> wrote:
> I have one array for example[1,2,3,4]
> i need to find the matching elements of another array is there any way
> to find....
> for example [1,2,3,4].include?(2)
> it will return true
> but i need to find one or more elements
> example : [1,2,3,4].include?(2,3)
> it is throwing an error

Depends what you want, if you just want to find out if the numbers 2
and 3 are in the other array, you could use:

== Array RDoc:
 array & other_array
 Set Intersection—Returns a new array containing elements common to
the two arrays, with no duplicates.
 [ 1, 1, 3, 5 ] & [ 1, 2, 3 ]   #=> [ 1, 3 ]

so you could do something like this:

>> class Array
>>   def contains?(array)
>>     (self & array) == array
>>   end
>> end
=> nil
>>
?> [1,2,3,4].contains?([1,2])
=> true
?> [1,2,3,4].contains?([1,3])
=> true
>> [1,2,3,4].contains?([1,9])
=> false
>> [1,2,3,4].contains?([12,3])
=> false
>> [1,2,3,4].contains?([2,3])
=> true


Mikel

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