The Easiest way to check if one array is a subset of another

ruby-talk
1

I want to find the easiest way if one array is a subset of another

for example

A b
[1,2,4,5,6,7,9] [1,3,9] =>true

A b
[1,2,4,5,6,7,9] [1,3,8] =>false

···

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2

Oop, i already found

b.to_set.subset?(a.to_set)

···

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3

If I understand correctly what you really want, the first example should produce false, as array "a" does not have 3. Assuming that you meant [1,2,3,4,5,6,7,9] I think the following will work for you:

(a & b) == b

Gennady.

···

-----Original Message-----
From: superdisconnect@hotmail.com [mailto:superdisconnect@hotmail.com]
Sent: Monday, August 03, 2009 10:13 PM
To: ruby-talk ML
Subject: The Easiest way to check if one array is a subset of another

I want to find the easiest way if one array is a subset of another

for example

A b
[1,2,4,5,6,7,9] [1,3,9] =>true

A b
[1,2,4,5,6,7,9] [1,3,8] =>false
--
Posted via http://www.ruby-forum.com/\.