center(*args) public

Centers str in width. If width is greater than the length of str, returns a new String of length width with str centered and padded with padstr; otherwise, returns str.

"hello".center(4)         #=> "hello"
"hello".center(20)        #=> "       hello        "
"hello".center(20, '123') #=> "1231231hello12312312"
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February 11, 2010 - (v1_8_7_72)
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Odd Number of padding characters

In the case of an odd number of empty spaces in a length, Ruby will append the extra character to the right-hand side of the string.

Example:

irb(main):002:0> "Hello".center(10,"-")
=> "--Hello---"