Considering that in the Ruby programming language everything is said to be an Object, I safely assumed that passing arguments to methods are done by reference. However this little example below puzzles me:

$string = "String"

def changer(s)
  s = 1
end

changer($string)

puts $string.class
String
 => nil

As you can see the original Object wasn't modified, I wish to know why, and also, how could I accomplish the desired behavior ie. Getting the method to actually change the object referenced by its argument.

ruby parameter-passing pass-by-reference
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