mask method

String mask({
  1. int start = 4,
  2. int end = 4,
  3. String maskChar = '*',
})

Implementation

String mask({int start = 4, int end = 4, String maskChar = '*'}) {
  if (length <= start + end) return this;
  return substring(0, start) +
      maskChar * (length - start - end) +
      substring(length - end);
}