function reverse( str ) {
	var len;
	var out;
	var ch1;
	var ch2;
	var i;

	len = str.length;
	out = '';

	// Process the string one Unicode code unit at a time and count UTF-16 surrogate pairs as a single Unicode code point...
	for ( i = 0; i < len; i++ ) {
		ch1 = str[ i ];

		// Check for a high UTF-16 surrogate...
		if ( RE_UTF16_HIGH_SURROGATE.test( ch1 ) ) {
			// Check for an unpaired surrogate at the end of the input string...
			if ( i === len-1 ) {
				// We found an unpaired surrogate...
				out = ch1 + out;
				break;
			}
			// Check whether the high surrogate is paired with a low surrogate...
			ch2 = str[ i+1 ];
			if ( RE_UTF16_LOW_SURROGATE.test( ch2 ) ) {
				// We found a surrogate pair:
				out = ch1 + ch2 + out;
				i += 1; // bump the index to process the next code unit
			} else {
				out = ch1 + out;
			}
		} else {
			out = ch1 + out;
		}
	}
	return out;
}
Reverses the Unicode code points of a string.

@param {string} str - input string
@returns {string} output string

@example
var out = reverse( 'last man standing' );
// returns 'gnidnats nam tsal'

@example
var out = reverse( 'presidential election' );
// returns 'noitcele laitnediserp'

@example
var out = reverse( 'JavaScript' );
// returns 'tpircSavaJ'

@example
var out = reverse( 'Hidden Treasures' );
// returns 'serusaerT neddiH'