Best way to add a method to the Array class

Rails
1

Hey guys, whats the best way to add a method to the array class so that
it will act on an array? Can you give an example?

2

On 10/19/06, Eric G. [email protected] wrote:

Hey guys, whats the best way to add a method to the array class so that
it will act on an array? Can you give an example?

–

Ruby classes are open, so you can simply do:

class Array
def sum
inject(0) { |sum,v| sum+=v }
end
end

You can also redefine existing methods, but you’ll have to be very
careful with that. alias is your friend.

Cheers,
Max

3

where would that code snippet go?

In the application controller?

Max M. wrote:

On 10/19/06, Eric G. [email protected] wrote:

Hey guys, whats the best way to add a method to the array class so that
it will act on an array? Can you give an example?

–

Ruby classes are open, so you can simply do:

class Array
def sum
inject(0) { |sum,v| sum+=v }
end
end

You can also redefine existing methods, but you’ll have to be very
careful with that. alias is your friend.

Cheers,
Max

4

On 10/19/06, Eric G. [email protected] wrote:

where would that code snippet go?

In the application controller?

No. Create a new file under lib, for example array_extensions.rb and
you should be fine.

Max