Returns a String-representation of this integer.
The returned string is parsable by parse.
For any int i, it is guaranteed that
i == int.parse(i.toString()).
Source
/**
* Returns a String-representation of this integer.
*
* The returned string is parsable by [parse].
* For any `int` [:i:], it is guaranteed that
* [:i == int.parse(i.toString()):].
*/
String toString();