如何从另一个数组中减去一个数组中的多个对象 [英] How to Subtract Multiple Objects from an Array with Another array

问题描述

我试图减去（即删除）多个对象，即在array1中找到的array2对象，以便最终结果是array2仅包含牛仔裤对象。

I'm trying to subtract, i.e. remove, multiple objects, namely the objects of array2 found in array1 so that the end result is that array2 only contains the "jean" object.

帮助！我迷路了。

我尝试了多次代码，如以下示例所示，但是没有用。

I tried multiple times code like the following example but it didn't worked.

array1= [{"caracname" : "charles"}, {"caracname" : "kevin"}]
array2= [{"caracname" : "charles"}, {"caracname" : "kevin"}, {"caracname" : "jean"}]
            
            array1.forEach(function (k) {
                delete array2[k];
            });
            
            console.log(array2);

推荐答案

操作方法如下：

function objectsEqual(o1, o2) {
    return o1.caracname === o2.caracname
}

function subtractArrays(a1, a2) {
    var arr = [];
    a1.forEach((o1) => {
       var found = false;
       a2.forEach((o2) => {
           if (objectsEqual(o1, o2)) {
                found = true;
           }  
       });
       if (!found) {
           arr.push(o1);
       }
    })
    return arr;
}

console.log(subtractArrays(array2, array1));

已固定在插件中： https://plnkr.co/edit/vA6oWg9R44f6k7ylyFh6?p=preview

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