Leaderboard

main.dart

import "dart:math";

List<List<String>> csv;

void main() {
  csv = [
    ["1", "Orange", "3"],
    ["2", "Apple", "4"],
    ["3", "Lemon", "4"],
    ["42", "Grapes", "6"]
  ];

  int getMaxLength(Iterable names) {
    return names
        .map<int>((n) => (n is num ? n.toString().length : n.length))
        .reduce(max);
  }

  String lpad(str, len) {
    int diff = max(0, len - str.length);

    return (" " * diff) + str;
  }

  String rpad(str, len) {
    int diff = max(0, len - str.length);

    return str + (" " * diff);
  }

  String col(List items) => "| " + items.join(" | ") + " |";

  String leaderboard(List data) {
    int col1Max = max("ID".length, getMaxLength(data.map((list) => list[0])));

    int col2Max =
        max("Teams".length, getMaxLength(data.map((list) => list[1])));

    int col3Max =
        max("Points".length, getMaxLength(data.map((list) => list[2])));

    String topHeader = "** Leaderboard **\n";

    String header = col(
        [rpad("ID", col1Max), rpad("Team", col2Max), rpad("Points", col3Max)]);

    String div = "-" * header.length;

    String rows = (data.fold<List<String>>(
        [],
        (init, v) => [
              ...init,
              col([
                lpad(v[0].toString(), col1Max),
                rpad(v[1].toString(), col2Max),
                lpad(v[2].toString(), col3Max)
              ])
            ]).join("\n"));

    return [topHeader, header, div, rows].join("\n");
  }

  print(leaderboard(csv));
}