在Ruby中打印水平线

Question

Can ruby's puts or print draw horizontal line kind of like bash does with printf+tr does ?

printf '%20s\n' | tr ' ' -

this will draw:

--------------------

Answer 1

You can use the following snippet

puts "-"*20

Check this for more help.

You might be interested in formatting using ljust , rjust and center as well.

Answer 2

I use a quick puts "*"*80 for debug purposes. I'm sure there are better ways.

Answer 3

For fancy lines:

p 'MY_LINE'.center(80,'_-')
#=> "_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-MY_LINE_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_"

Answer 4

You could also have the following:

puts "".center(20, "-")

irb(main):005:0> puts "".center(20, '-')
=> "--------------------"

This could be more flexible if you wanted to add additional information:

irb(main):007:0> puts "end of task".center(20, "-")
----end of task-----
=> nil

Answer 5

You can also use String#ljust or String#rjust .

puts ''.rjust(20,"-")
# >> --------------------
puts ''.ljust(20,"-")
# >> --------------------