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57 lines
1.3 KiB
57 lines
1.3 KiB
2 years ago
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# Data Structures
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### Instructions
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In this exercise you will work with the following data structures: List, Set, and Map.
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Declare and initialize following variables:
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- `listNum` of type `List<int>` containing a list of integers (list length >= 5);
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- `listObj` of type `List<Object>` containing a list of items of different types (list length >= 4);
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- `listStr` of type `List<String>` containing a list of strings (list length >= 3);
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- `listList` of type `List<List<Object>>` containing a list of lists containing `listNum`, `listObj`, `listStr`;
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- `setStr` of type `Set<String>` containing at least 3 items;
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- `mapStr` of type `Map<String, int>` containing at least 3 pairs;
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### Usage
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### List
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List is an array of elements. In dart lists are initialized as following:
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```dart
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var listNum1 = [1, 2, 3];
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// or ...
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List<int> listNum2 = [1, 2, 3];
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```
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### Set
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Set is an unordered collection of unique items. Sets are created as follows:
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```dart
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var set1 = {'Germany', 'Kazakhstan', 'France', 'England'};
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// or ...
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Set<String> set2 = {'Germany', 'Kazakhstan', 'France', 'England'};
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```
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### Map
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Map is a key-value data structure. Maps are created as:
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```dart
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var mapRadius = {
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'Earth': 6378.1,
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'Jupiter': 71492,
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'Moon': 1738.1,
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};
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// or ...
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Map<String, double> mapRadius = {
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'Earth': 6378.1,
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'Jupiter': 71492,
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'Moon': 1738.1,
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};
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```
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- Note: main is not needed!
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