Dartでランダムな二次元配列作ってそれをある列で縦に足す

fold

import 'dart:math' as math;

void main() {
  var random = math.Random();
  var hoge = [
    List.generate(10, (int i) => random.nextInt(100) + 1),
    List.generate(10, (int i) => random.nextInt(100) + 1),
    List.generate(10, (int i) => random.nextInt(100) + 1),
    List.generate(10, (int i) => random.nextInt(100) + 1),
  ];
  
  var index = 4;
  print(hoge.fold<int>(0, (acc, element) {
    return acc + element[index];
  }));
}