Method's output vs return

General

Return value is what is returned by the method. Output is what is done by the method

For example






Puts return a 'nil' object. However, puts's output displays the arguments into the screen.

Return value

With return value, you could chain methods.

For example

a = [1,2,3]
a.map { | num | num * 2 }.join

This will return an array [2,4,6]. Then , a join method is called upon the new array resulting in a string "246".