center(str, integer, padstr=' ')
public

Works just like String#center, only integer specifies characters instead of bytes.

Example:

  "¾ cup".chars.center(8).to_s
  #=> " ¾ cup  "

  "¾ cup".chars.center(8, " ").to_s # Use non-breaking whitespace
  #=> " ¾ cup  "