substring method Null safety
The substring of this string from start, inclusive, to end, exclusive.
Example:
const string = 'dartlang';
var result = string.substring(1); // 'artlang'
result = string.substring(1, 4); // 'art'
Both start and end must be non-negative and no greater than length;
end, if provided, must be greater than or equal to start.
Implementation
String substring(int start, [int? end]);