Reverses a string.

Use String.split('') and Iterable.reversed to reverse the order of the runes in the string.
Use Iterable.join('') to combine the runes and get the reversed string.

代码实现

String reverseString(String str) {
  return str.split('').reversed.join('');
}

使用样例

reverseString('foobar'); // 'raboof'