66 lines
2.1 KiB
Dart
66 lines
2.1 KiB
Dart
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import 'package:platform_collections/platform_collections.dart';
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void main() {
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// Create a new collection
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final numbers = Collection([1, 2, 3, 4, 5]);
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print('Original collection: ${numbers.all()}');
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// Demonstrate some collection methods
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print('Average: ${numbers.avg()}');
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print('Chunks of 2: ${numbers.chunk(2).map((chunk) => chunk.all())}');
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print('Every 2nd item: ${numbers.everyNth(2).all()}');
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print('Except indices [1, 3]: ${numbers.except([1, 3]).all()}');
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print('First even number: ${numbers.firstWhere((n) => n % 2 == 0)}');
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print('Reversed: ${numbers.reverse().all()}');
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// Demonstrate map and filter operations
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final doubled = numbers.mapCustom((n) => n * 2);
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print('Doubled: ${doubled.all()}');
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final evenNumbers = numbers.whereCustom((n) => n % 2 == 0);
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print('Even numbers: ${evenNumbers.all()}');
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// Demonstrate reduce operation
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final sum = numbers.fold<int>(0, (prev, curr) => prev + curr);
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print('Sum: $sum');
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// Demonstrate sorting
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final sortedDesc = numbers.sortCustom((a, b) => b.compareTo(a));
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print('Sorted descending: ${sortedDesc.all()}');
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// Demonstrate search
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final searchResult = numbers.search(3);
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print('Index of 3: $searchResult');
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// Demonstrate JSON conversion
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print('JSON representation: ${numbers.toJson()}');
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// Demonstrate operations with non-numeric collections
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final fruits = Collection(['apple', 'banana', 'cherry', 'date']);
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print('\nFruits: ${fruits.all()}');
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print(
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'Fruits starting with "b": ${fruits.whereCustom((f) => f.startsWith('b')).all()}');
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print(
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'Fruit names in uppercase: ${fruits.mapCustom((f) => f.toUpperCase()).all()}');
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// Demonstrate nested collections
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final nested = Collection([
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[1, 2],
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[3, 4],
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[5, 6],
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]);
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print('\nNested collection: ${nested.all()}');
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print('Flattened: ${nested.flatten().all()}');
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// Demonstrate grouping
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final people = Collection([
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{'name': 'Alice', 'age': 25},
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{'name': 'Bob', 'age': 30},
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{'name': 'Charlie', 'age': 25},
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{'name': 'David', 'age': 30},
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]);
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final groupedByAge = people.groupBy((person) => person['age']);
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print('\nPeople grouped by age: $groupedByAge');
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}
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