stringWithSeparator static method

String stringWithSeparator(String string, { int separateEvery = 4, String separator = '-', })

Separate string with separator you specify

const number = 089111222333;

final result = GlobalFunction.stringWithSeparator('$number', separateEvery: 3);

print(result); // 089-111-222-333

Implementation

static String stringWithSeparator(
  String string, {
  int separateEvery = 4,
  String separator = '-',
}) {
  final List<String> tempList = [];

  var count = 0;
  while (count < string.length) {
    int endSubstring = 0;

    /// Check if current count + separateEvery offset of total length
    /// if offset, take the rest of the available strings
    /// otherwise take string with [rumus] separateEvery + count
    if (separateEvery + count > string.length) {
      // 12 + (13-12)
      endSubstring = count + (string.length - count);
    } else {
      endSubstring = separateEvery + count;
    }

    final substring = string.substring(count, endSubstring);
    tempList.add(substring);
    count += separateEvery;
  }
  final join = tempList.join(separator);

  return join;
}