javascript - 从 Object.freeze 获取随机对象

Question

如何编写 getRandomCounty() 函数以始终从 countyCode 返回随机对象:

export class AppComponent {
  countyCode: { [key: string]: string } = Object.freeze({
    '01': 'Alba',
    '02': 'Arad',
    '03': 'Arges',
    '04': 'Bacau',
    '05': 'Bihor',
    '06': 'Bistrita-Nasaud',
    '07': 'Botosani',
    '08': 'Brasov',
    '09': 'Braila',
    10: 'Buzau',
    11: 'Caras-Severin',
    12: 'Cluj',
    13: 'Constanta',
    14: 'Covasna',
    15: 'Dambovita',
    16: 'Dolj',
    17: 'Galati',
    18: 'Gorj',
    19: 'Harghita',
    20: 'Hunedoara',
    21: 'Ialomita',
    22: 'Iasi',
    23: 'Ilfov',
    24: 'Maramures',
    25: 'Mehedinti',
    26: 'Mures',
    27: 'Neamt',
    28: 'Olt',
    29: 'Prahova',
    30: 'Satu Mare',
    31: 'Salaj',
    32: 'Sibiu',
    33: 'Suceava',
    34: 'Teleorman',
    35: 'Timis',
    36: 'Tulcea',
    37: 'Vaslui',
    38: 'Valcea',
    39: 'Vrancea',
    40: 'Bucuresti',
    41: 'Bucuresti S.1',
    42: 'Bucuresti S.2',
    43: 'Bucuresti S.3',
    44: 'Bucuresti S.4',
    45: 'Bucuresti S.5',
    46: 'Bucuresti S.6',
    51: 'Calarasi',
    52: 'Giurgiu'
  });

  getRandomCounty() { // this must return random object from countyCode like {'03': 'Arges'}
     // ?????
  }
}

Answer 1

你可以这样做:-

function getRandomCounty(obj) {
    const keys = Object.keys(obj);
    const randomeIndex = Math.floor(Math.random() * (keys.length));
    return obj[keys[randomeIndex]];
}