Ruby: Object.to_a replacement

Question

I need to convert a passed in argument (single object or collection) to an Array. I don\'t know what the argument is. If it is an Array already, I want to leave it, otherwis

Answer 1

Wow, someone just necromanced a really old thread. :-O But since I don't see it included yet, I'll add one more way for completeness' sake:

arg = [*arg]

This will splat the argument if it already is an array (thus removing one level of nesting) or create a one-argument array otherwise:

arg = [1,2,3]
[*arg] #=> [1, 2, 3]
arg = 1
[*arg] #=> [1]