toDigitWithPlus static method

String toDigitWithPlus(
  1. String? value
)

Converts a string to contain only digits and a plus sign.

Example: '123abc!@#' -> '123+'

Implementation

static String toDigitWithPlus(String? value) {
  String buffer = '';
  if (value != null) {
    for (String character in value.characters) {
      if (character == '+' || Validator.isDigit(character)) {
        buffer = '$buffer$character';
      }
    }
  }
  return buffer;
}