从JavaScript中的对象数组中删除重复项

Question

从JavaScript中的对象数组中删除重复项

我有一个包含对象数组的对象。

things = new Object();

things.thing = new Array();

things.thing.push({place:"here",name:"stuff"});

things.thing.push({place:"there",name:"morestuff"});

things.thing.push({place:"there",name:"morestuff"});

我想知道从数组中删除重复对象的最佳方法是什么。所以，例如，事情会变成......

{place:"here",name:"stuff"},

{place:"there",name:"morestuff"}

Answer 1

让我们看看......一个原始的：var&nbsp;obj&nbsp;=&nbsp;{};for&nbsp;(&nbsp;var&nbsp;i=0,&nbsp;len=things.thing.length;&nbsp;i&nbsp;<&nbsp;len;&nbsp;i++&nbsp;) &nbsp;&nbsp;&nbsp;&nbsp;obj[things.thing[i]['place']]&nbsp;=&nbsp;things.thing[i];things.thing&nbsp;=&nbsp;new&nbsp;Array();for&nbsp;(&nbsp;var&nbsp;key&nbsp;in&nbsp;obj&nbsp;) &nbsp;&nbsp;&nbsp;&nbsp;things.thing.push(obj[key]);好吧，我认为应该这样做。看看，特拉维斯。编辑编辑代码以正确引用place（以前id）属性。

Answer 2

如果您可以使用Javascript库，例如下划线或lodash，我建议您查看_.uniq其库中的函数。来自lodash：_.uniq(array, [isSorted=false], [callback=_.identity], [thisArg])基本上，你传入的数组在这里是一个对象文字，你传入要在原始数据数组中删除重复项的属性，如下所示：var data = [{'name': 'Amir', 'surname': 'Rahnama'}, {'name': 'Amir', 'surname': 'Stevens'}];var non_duplidated_data = _.uniq(data, 'name');

Answer 3

我有完全相同的要求，根据单个字段上的重复项删除数组中的重复对象。我在这里找到了代码：Javascript：从对象数组中删除重复项所以在我的例子中，我正在从数组中删除任何具有重复的licenseNum字符串值的对象。var arrayWithDuplicates = [     {"type":"LICENSE", "licenseNum": "12345", state:"NV"},     {"type":"LICENSE", "licenseNum": "A7846", state:"CA"},     {"type":"LICENSE", "licenseNum": "12345", state:"OR"},     {"type":"LICENSE", "licenseNum": "10849", state:"CA"},     {"type":"LICENSE", "licenseNum": "B7037", state:"WA"},     {"type":"LICENSE", "licenseNum": "12345", state:"NM"}];function removeDuplicates(originalArray, prop) {      var newArray = [];      var lookupObject  = {};      for(var i in originalArray) {         lookupObject[originalArray[i][prop]] = originalArray[i];      }      for(i in lookupObject) {          newArray.push(lookupObject[i]);      }       return newArray;  }var uniqueArray = removeDuplicates(arrayWithDuplicates, "licenseNum");console.log("uniqueArray is: " + JSON.stringify(uniqueArray));结果：uniqueArray是：[{"type":"LICENSE","licenseNum":"10849","state":"CA"},{"type":"LICENSE","licenseNum":"12345","state":"NM"}, {"type":"LICENSE","licenseNum":"A7846","state":"CA"},{"type":"LICENSE","licenseNum":"B7037","state":"WA"}]