In Ruby version 2.2, how do you find out the size of the memory occupied by an object?

Question

ruby

I decided to ask how much memory the array eats, but I never googled the answer. Among the answers were not relevant for version 2.2.

Answer 1

You need to include the ObjectSpace standard library.
The ObjectSpace module has a memsize_of(obj) method.

require 'objspace'
hash = {a: 1, b: 2}
ObjectSpace.memsize_of(hash)
# => 240