56 lines
1.2 KiB
Dart
56 lines
1.2 KiB
Dart
///
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/// Collections
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///
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main(List<String> args) {
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// Fixed-length list
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List<int> fixedNumList = List(5);
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fixedNumList[0] = 10;
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fixedNumList[1] = 11;
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fixedNumList[2] = 12;
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fixedNumList[3] = 13;
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fixedNumList[4] = 14;
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print(fixedNumList);
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fixedNumList[0] = 100;
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fixedNumList[1] = null;
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print(fixedNumList);
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for (var item in fixedNumList) {
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print(item);
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}
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fixedNumList.forEach((element) => print(element ?? 'null value'));
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print('length: ${fixedNumList.length}');
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print('');
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// Growable list
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List<String> growableList = ['aaa', 'bbb', 'ccc'];
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growableList.add('ddd');
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growableList.add('eee');
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growableList.addAll(['fff', 'ggg']);
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print(growableList);
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growableList.remove('ggg');
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growableList.removeAt(2);
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print(growableList);
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growableList.clear();
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print(growableList);
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growableList..add('111')..add('222')..add('333');
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print(growableList);
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// Map
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Map<String, int> fruits = {"apple": 1, "banana": 2, "guava": 3};
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fruits["pear"]=4;
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print(fruits);
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fruits.forEach((k, v) => print('key:$k,value:$v'));
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// Set
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Set<String> countries = Set.from(["USA", "INDIA", "CHINA"]); // from a list
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countries.add("Japan");
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print(countries);
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}
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