changeLetter method

String changeLetter(
  1. String inS,
  2. int pos,
  3. String newS
)

:QUEST: ?? Make it better with regExp? Change letter/s in a String

Implementation

String changeLetter(String inS, int pos, String newS) {
  //print(inS);
  int length = inS.length;
  String _s1 = inS.substring(0, pos - 1);
  //print(_s1);
  String _s2 = inS.substring(pos, pos + 1); //  wanted OLD letter for change
  _s2 = newS; //  Now it is changed
  //print(_s2);
  String _s3 = inS.substring(pos, length);
  //print(_s3);
  String s4 = '$_s1$_s2$_s3';
  //print(s4);
  return s4;
}