count static method
Counts the number of occurrences of string
Implementation
static Map<String, int> count(String str) {
String _str = str.removeWhitespace;
Map<String, int> map = <String, int>{};
for (int i = 0; i < _str.length; i++) {
int count = map[_str[i]] ?? 0;
map[_str[i]] = count + 1;
}
return map;
}