performance test

built_and_reqular_performance_test.dart

import 'dart:math';

import 'package:built_collection/built_collection.dart';
import 'package:flutter_test/flutter_test.dart';

const iterations = 100000;

void main() {
  test("test", () async {
    final numbers = List.generate(iterations, (index) => index);

    ///MAP
    final map = <int, String>{};
    numbers.forEach((number) {
      map[number] = number.toString();
    });

    final builtMap = MapBuilder<int, String>();
    builtMap..addIterable(numbers, key: (key) => key, value: (key) => key.toString());

    testBuildMap(builtMap.build());
    testMap(map);

    ///List
    final builtList = ListBuilder<int>(numbers);
    testBuildList(builtList.build());
    testList(numbers);
  });
}

void testBuildMap(BuiltMap<int, String> map) {
  final timeStart = DateTime.now().millisecondsSinceEpoch;
  map.rebuild((b) {
    for (int i = 0; i < iterations; i++) {
      final randomNumber = Random().nextInt(iterations);
      b.updateValue(randomNumber, (s) => randomNumber.toString());
    }
    return b;
  });

  print('built map spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart)}');
  print('built map spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart) / iterations}');
}

void testMap(Map<int, String> map) {
  final timeStart = DateTime.now().millisecondsSinceEpoch;
  for (int i = 0; i < iterations; i++) {
    final randomNumber = Random().nextInt(iterations);
    map[randomNumber] = randomNumber.toString();
  }
  print('map spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart)}');
  print('map spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart) / iterations}');
}

void testBuildList(BuiltList<int> list) {
  final timeStart = DateTime.now().millisecondsSinceEpoch;
  list.rebuild((b) {
    for (int i = 0; i < iterations; i++) {
      final randomNumber = Random().nextInt(iterations);
      b.update((b) => b[randomNumber] = randomNumber);
    }
    return b;
  });

  print('built list spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart)}');
  print('built list spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart) / iterations}');
}

void testList(List<int> list) {
  final timeStart = DateTime.now().millisecondsSinceEpoch;
  for (int i = 0; i < iterations; i++) {
    final randomNumber = Random().nextInt(iterations);
    list[randomNumber] = randomNumber;
  }
  print('list spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart)}');
  print('list spend: ${(DateTime.now().millisecondsSinceEpoch - timeStart) / iterations}');
}