遍历JSON并将结果放入数组中

Question

我从一个REST API得到了一个JSON对象，类似于这样：

{
  success: true,
  message: "",
  result: [{
      Currency: "GBP",
      IsActive: true,
      BaseAddress: "1N52wHoVR79PMDishab2XmRHsbekCdGquK",
      Notice: null
    },
    {
      Currency: "USD",
      IsActive: true,
      BaseAddress: "LhyLNfBkoKshT7R8Pce6vkB9T2cP2o84hx",
      Notice: null
    },
    {
      Currency: "YEN",
      IsActive: true,
      BaseAddress: "D9GqmkGCpgtnXP7xMD78v9xfqeDkqBZBMT",
      Notice: null
    }
  ]
};

我只想要一个货币值列表，所以我像这样进行迭代：

var data = body.result;
for (var i in data) {
  var id = data[i].Currency;
  console.log(id)
}

控制台打印正常：

GDP
USD
YEN

但我想把这些字符串放到一个新的数组中，但不知道该怎么做。有什么想法吗？

- bitcoder.io

---

讨厌的人会说它不是 JSON，但我们明白你的意思。 - Jeremy Thille

抱歉 Jeremy，我不知道你的意思，我做错了什么吗？（我是一个尝试学习的新手，很害怕。） - bitcoder.io

没什么，只是这不是一个正确、有效的JSON格式，而是一个Javascript对象。许多JSON纳粹开发者喜欢抨击那些犯这种错误的人。 - Jeremy Thille

Answer 1

只需使用 Array#Map 函数：

const data = {
  success: true,
  message: "",
  result: [{
      Currency: "GBP",
      IsActive: true,
      BaseAddress: "1N52wHoVR79PMDishab2XmRHsbekCdGquK",
      Notice: null
    },
    {
      Currency: "USD",
      IsActive: true,
      BaseAddress: "LhyLNfBkoKshT7R8Pce6vkB9T2cP2o84hx",
      Notice: null
    },
    {
      Currency: "YEN",
      IsActive: true,
      BaseAddress: "D9GqmkGCpgtnXP7xMD78v9xfqeDkqBZBMT",
      Notice: null
    },
    {
      Currency: "YEN",
      IsActive: true,
      BaseAddress: "D9GqmkGCpgtnXP7xMD78v9xfqeDkqBZBMT",
      Notice: null
    }
  ]
}

const currencies = [...new Set(data.result.map(a => a.Currency))];
  
console.log(currencies);

- Erazihel

---

如果有重复怎么办？我们可能不想要 ["USD","USD","USD"]。 - Jeremy Thille

@bitcoder.io 如果我的回答对您有帮助，请点赞并验证一下 :) - Erazihel

抱歉，Erazihel，我没有足够的声望来点赞，但是一旦我有了，我一定会点赞。非常好的答案！ - bitcoder.io

Answer 2

var body = {
  success: true,
  message: "",
  result: [{
      Currency: "GBP",
      IsActive: true,
      BaseAddress: "1N52wHoVR79PMDishab2XmRHsbekCdGquK",
      Notice: null
    },
    {
      Currency: "USD",
      IsActive: true,
      BaseAddress: "LhyLNfBkoKshT7R8Pce6vkB9T2cP2o84hx",
      Notice: null
    },
    {
      Currency: "YEN",
      IsActive: true,
      BaseAddress: "D9GqmkGCpgtnXP7xMD78v9xfqeDkqBZBMT",
      Notice: null
    }
  ]
};

var res = body.result.map(item => { return item.Currency });

console.log(res);

- Rohìt Jíndal