how to access list of list in dart code example

Example: get single element from list in dart

var firstList = [1,2,3,4,5,6]; print(firstList.firstWhere((i) => i < 4)); // 1  var sList = ['one', 'two', 'three', 'four']; print(sList.firstWhere((i) => i.length > 3)); // three