find if an array has any element present in another array

[Charanya Nagarajan]

Hi,

I have 2 lists

a=[1,2,3,4]
b=[2,4,6,7,8]

I want to find if there are any elements present in "a" which are also
present in "b".
I jus wanna "true" or "false" answer if both of the arrays have any
element in common.

Is there any inbuilt functions like "include?" for this purpose??

Thanks in Advance.

 

[as]

Le Thu, 30 Apr 2009 05:52:26 -0500,

I have 2 lists

a=[1,2,3,4]
b=[2,4,6,7,8]

I want to find if there are any elements present in "a" which are also
present in "b".
I jus wanna "true" or "false" answer if both of the arrays have any
element in common.

(a-b).nil?

 

[7stud --]

Hi,

I have 2 lists

a=[1,2,3,4]
b=[2,4,6,7,8]

I want to find if there are any elements present in "a" which are also
present in "b".
I jus wanna "true" or "false" answer if both of the arrays have any
element in common.

Is there any inbuilt functions like "include?" for this purpose??

Thanks in Advance.

a=[1,2,3,4]
b=[2,4,6,7,8]

result = a & b
p result

puts (a & b).empty?

--output:--
[2, 4]
false

 

[Farrel Lifson]

I have 2 lists

a=[1,2,3,4]
b=[2,4,6,7,8]

I want to find if there are any elements present in "a" which are also
present in "b".
I jus wanna "true" or "false" answer if both of the arrays have any
element in common.

You can take the intersection of the two and see if it's empty.

if (a & b).empty?
puts( 'Nothing in common' )
else
puts( 'Common elements')
end

Farrel

 

[Charanya Nagarajan]

Thank you.This was What i wanted

 

[as]

Le Thu, 30 Apr 2009 12:57:23 +0200,

Le Thu, 30 Apr 2009 05:52:26 -0500,

I have 2 lists

a=[1,2,3,4]
b=[2,4,6,7,8]

I want to find if there are any elements present in "a" which are
also present in "b".
I jus wanna "true" or "false" answer if both of the arrays have any
element in common.

(a-b).nil?

Ouch, sorry, (a&b).empty?

 

[7stud --]

(a-b).nil?

result = [1] - [2, 3] #no common elements
p result

result = [2, 3] - [2] #common elements
p result

--output:--
[1]
[3]