why does psych yaml interpreter add line breaks around 80 characters?

Question

Psych is the default yaml engine since ruby 1.9.3

Why, oh why does psych add a line break in its output? Check the example below.

ruby -v # => ruby 1.         


        

Answer 1

yaml.to_yaml(options = {:line_width => -1})

is ok to solve the problem.

but RuboCop say

Useless assignment to variable - options.

so

yaml.to_yaml(line_width: -1)

is better.