如果满足某些条件，则从javaScript数组中删除重复的对象

Question

我有一个包含许多对象（药物）的数组。 每个对象都有3个键：“ Drug1”，“ Drug2”和riskingRate。 如果Drug1和Drug2的值相同，如何删除重复的对象（r​​iskingRate在查找重复项中不重要）。 然后将对象保持较高的riskingRate比率并删除其他对象。 这是一个简单的数组：

var Warfarin = [{
    "Drug1": "Warfarin",
    "Drug2": "vitamin K",
    "riskRating": "C",
}, {
    "Drug": "aspirin",
    "Drug2": "MiFEPRIStone",
    "riskRating": "C",
}, {
    "Drug1": "Warfarin",
    "Drug2": "Omacetaxine",
    "riskRating": "X",
}, {
    "Drug1": "Warfarin",
    "Drug2": "vitamin K",
    "riskRating": "X",
},{
    "Drug1": "Warfarin",
    "Drug2": "vitamin K",
    "riskRating": "A",
}]

在此示例中，对象0、3和4是重复的，并且对象3具有较高的riskingRate。 （汇率X> D> C> B> A）。 我如何删除对象0和4，并保留对象1,2和3。谢谢。

Answer 1

您可以执行以下操作：

 var weights = ["X", "D", "C", "B", "A"]; var Warfarin = [{ "Drug1": "Warfarin", "Drug2": "vitamin K", "riskRating": "C", }, { "Drug": "aspirin", "Drug2": "MiFEPRIStone", "riskRating": "C", }, { "Drug1": "Warfarin", "Drug2": "Omacetaxine", "riskRating": "X", }, { "Drug1": "Warfarin", "Drug2": "vitamin K", "riskRating": "X", },{ "Drug1": "Warfarin", "Drug2": "vitamin K", "riskRating": "A", }]; var response = Warfarin.sort((v1, v2) => (weights.indexOf(v1.riskRating) - weights.indexOf(v2.riskRating))) .reduce((a, c)=>{ if(!a.some(v => (v.Drug1 == c.Drug1 && v.Drug2 == c.Drug2))){ a.push(c); } return a; }, []); console.log(response); 

这样做是首先根据对象的riskRating对数组进行排序，以便将较高风险的对象放在开头，然后仅缩小数组，而不在结果数组中包含重复项。

Answer 2

这是一个没有排序的解决方案，但是带有ES6 Map ，这将使其在O（n）时间而不是O（nlogn）内运行 ：

 const Warfarin = [{"Drug1": "Warfarin","Drug2": "vitamin K","riskRating": "C",}, {"Drug": "aspirin","Drug2": "MiFEPRIStone","riskRating": "C",}, {"Drug1": "Warfarin","Drug2": "Omacetaxine","riskRating": "X",},{"Drug1": "Warfarin","Drug2": "vitamin K","riskRating": "X",},{"Drug1": "Warfarin","Drug2": "vitamin K","riskRating": "A",}]; const result = Array.from(Warfarin.reduce ( (acc, obj) => { const key = JSON.stringify([obj.Drug1,obj.Drug2]); return !acc.has(key) || acc.get(key).riskRating < obj.riskRating ? acc.set(key, obj) : acc; }, new Map).values()); console.log(result); 

 .as-console-wrapper { max-height: 100% !important; top: 0; }