)
Returns the substring of this string that extends from startIndex,
inclusive, to endIndex, exclusive.
var string = 'dartlang';
string.substring(1); // 'artlang'
string.substring(1, 4); // 'art'
Source
/**
* Returns the substring of this string that extends from [startIndex],
* inclusive, to [endIndex], exclusive.
*
* var string = 'dartlang';
* string.substring(1); // 'artlang'
* string.substring(1, 4); // 'art'
*/
String substring(int startIndex, [int endIndex]);