迭代JSON将结果放入数组中

Question

我有一个来自REST API的JSON对象，如下所示：

{
  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，所以我会像这样迭代它：

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

但是我想将这些字符串放入一个新的数组中，并且无法弄清楚如何做到这一点。有什么想法吗？

Answer 1

只需使用Array#Map功能：

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);

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);