Javascript中的不同对象值

Question

如何使用Javascript区分相同的对象数据值？ES-10/ES-10

对于给定的数据值

[{Zone: "2"},
{Zone: "4"},
{Zone: "4"},
{Zone: "6"},
{Zone: "1"},
{Zone: "2"},
{Zone: "3"},
{Zone: "3"},
{Zone: "4"},
{Zone: "4"}]

在它分开之后，它会回来

[{Zone: "1"},
 {Zone: "2"},
 {Zone: "2"},
 {Zone: "3"},
 {Zone: "4"},
 {Zone: "6"}]

Answer 1

一种可能的办法是：

​

var arr = [{Zone: "2"}, {Zone: "4"}, {Zone: "4"}, {Zone: "6"}, {Zone: "1"}, {Zone: "2"}, {Zone: "3"}, {Zone: "3"}, {Zone: "4"}, {Zone: "4"}]

var resp = [...new Set(arr.map(({ Zone }) => Zone))].sort().map(x => ({Zone: x}));
console.log(resp);

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​

对于这种新方法，您可以在原始数组中使用map by Zones使用resp，如下所示：

​

var arr = [{Zone: "2" , Assign: "1"}, {Zone: "4", Assign: "2"}, {Zone: "4", Assign: "3"}, {Zone: "6", Assign: "4"}, {Zone: "1", Assign: "5"}, {Zone: "2", Assign: "6"}, {Zone: "3", Assign: "7"}, {Zone: "3", Assign: "8"}, {Zone: "4", Assign: "9"}, {Zone: "4", Assign: "10"}]

var resp = [...new Set(arr.map(({ Zone }) => Zone))].sort().map(x => ({Zone: x}));

var newresp = resp.map(({ Zone }) => {
  var assigns = arr.filter(x => x.Zone == Zone).map(x => x.Assign);
  return {
    Zone: Zone,
    Assign: assigns
  }
})
console.log(newresp)

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​

Answer 2

var lookup = {};
var items = [{Zone: "2"},
{Zone: "4"},
{Zone: "4"},
{Zone: "6"},
{Zone: "1"},
{Zone: "2"},
{Zone: "3"},
{Zone: "3"},
{Zone: "4"},
{Zone: "4"}];
var result = [];

for (var item, i = 0; item = items[i++];) {
  var zone = item.Zone;

  if (!(zone in lookup)) {
    lookup[zone] = 1;
    result.push(zone);
  }
}