insertSeparator static method

String insertSeparator(
  1. String str, {
  2. int interval = 4,
  3. String separator = ' ',
})

插入分隔符 Insert separator

Implementation

static String insertSeparator(String str, {int interval = 4, String separator = ' '}) {
  final result = StringBuffer();
  for (int i = 0; i < str.length; i++) {
    if (i > 0 && i % interval == 0) {
      result.write(separator);
    }
    result.write(str[i]);
  }
  return result.toString();
}