public/subjects/mobile-dev/data-structures

Data Structures

Instructions

In this exercise you will work with the following data structures: List, Set, and Map.

Declare and initialize following variables:

• listNum of type List<int> containing a list of integers (list length >= 5);
• listObj of type List<Object> containing a list of items of different types (list length >= 4);
• listStr of type List<String> containing a list of strings (list length >= 3);
• listList of type List<List<Object>> containing a list of lists containing listNum, listObj, listStr;
• setStr of type Set<String> containing at least 3 items;
• mapStr of type Map<String, int> containing at least 3 pairs;

Usage

List

List is an array of elements. In dart lists are initialized as following:

var listNum1 = [1, 2, 3];
// or ...
List<int> listNum2 = [1, 2, 3];

Set

Set is an unordered collection of unique items. Sets are created as follows:

var set1 = {'Germany', 'Kazakhstan', 'France', 'England'};
// or ...
Set<String> set2 = {'Germany', 'Kazakhstan', 'France', 'England'};

Map

Map is a key-value data structure. Maps are created as:

var mapRadius = {
  'Earth': 6378.1,
  'Jupiter': 71492,
  'Moon': 1738.1,
};
// or ...
Map<String, double> mapRadius = {
  'Earth': 6378.1,
  'Jupiter': 71492,
  'Moon': 1738.1,
};

• Note: main is not needed!