How to cast a String to char[] in Dart

How to convert a String to an array of char in Dart ?

I’ve tried to cast a String to a List of char and it didn’t work

>Solution :

Loop through the string, and assign each character to the end of a List. Please mark my answer as accepted. Code is given below:

void main() {
  String str = 'This is a string.';
  List charStr = [];
  for(var i=0; i<str.length; i++ ) {

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