如何从列表数组中删除Duplicate

Question

var cars = [
    { year: 2007, model: "Ford F-150" },
    { year: 2011, model: "Toyota Camry" },
    { year: 2007, model: "Ford F-150" },
    { year: 2007, model: "Ford F-150" },
    { year: 2005, model: "Dodge RAM" }
    { year: 2005, model: "Dodge RAM" };
];

如何从此数组列表中删除重复

Answer 1

根据indexOf条件轻松过滤重复项，这适用于简单项目。在您的情况下，您无法使用它，因为数组中的两个相似对象不相同，因此indexOf无效。

对于这种情况，可以方便地使用Array.prototype.reduce：

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var cars = [
    { year: 2007, model: "Ford F-150" },
    { year: 2011, model: "Toyota Camry" },
    { year: 2007, model: "Ford F-150" },
    { year: 2007, model: "Ford F-150" },
    { year: 2005, model: "Dodge RAM" },
    { year: 2005, model: "Dodge RAM" }
]; 

cars = cars.reduce(function(prev, curr) {
    var inArray = prev.some(function(car) {
        return car.model === curr.model && car.year === curr.year;
    });
    if (!inArray) {
        prev.push(curr);
    }
    return prev;
}, []);

alert(JSON.stringify( cars, null, 4) )

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