A summary of some testing I did on this jsperf test: http://jsperf.com/ordinal-suffix | Blog post about this here: http://remy.bach.me.uk/2012/12/ordinal-suffix

ordinal suffix testing

num = '0'
    fastest: `< ternary`                slowest: `Regex` by 67%.

num = '1'
    fastest: `Regex`                    slowest: `|| ternary` by 65%

num = '2'
    fastest: `< ternary`                slowest: `|| ternary` by 64%

num = '3'
    fastest: `< ternary`                slowest: `|| ternary` by 63%

num = '4'
    fastest: `Regex`                    slowest: `|| ternary` by 65%

num = '5'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 67%

num = '6'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 60%

num = '7'
    fastest: `< ternary`                slowest: `Regex` by 17%

num = '8'
    fastest: `< ternary`                slowest: `|| ternary` by 69%

num = '9'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 66%

num = '10'
    fastest: `Regex`                    slowest: `|| ternary` by 62%

num = '11'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 68%

num = '12'
    fastest: `Regex`                    slowest: `|| ternary` by 68%

num = '13'
    fastest: `Regex`                    slowest: `|| ternary` by 69%

num = '14'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 68%

num = '15'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 69%

num = '16'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 69%

num = '17'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 68%

num = '18'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 70%

num = '19'
    fastest: `Regex` AND `< ternary`    slowest: `|| ternary` by 71%

num = '20'
    fastest: `|| ternary`               slowest: `Slice` by 68%

num = '21'
    fastest: `|| ternary`               slowest: `Slice` by 75%

num = '22'
    fastest: `|| ternary`               slowest: `Regex` AND `Slice` by 78%

num = '23'
    fastest: `|| ternary`               slowest: `Regex` by 83%

num = '24'
    fastest: `|| ternary`               slowest: `Regex` by 87%

num = '25'
    fastest: `< ternary`                slowest: `Regex` by 59%