Reverses a string.
input string
options
reversed string
var out = reverseString( 'last man standing', { 'mode': 'code_unit' }); // returns 'gnidnats nam tsal'
var out = reverseString( '🐶🐮🐷🐰🐸', { 'mode': 'grapheme' }); // returns '🐸🐰🐷🐮🐶'
Reverses a string.