我们如何在 JS 中提取 2 个对象的相交键及其相交值？答案

【问题标题】：How can we extract intersecting key and its intersecting values of 2 objects in JS?我们如何在 JS 中提取 2 个对象的相交键及其相交值？
【发布时间】：2020-06-24 06:18:39
【问题描述】：

例如：

const a={color:[red,green,blue],fruits:[apple,banana]}

const b ={color:[红、黑、蓝]}

一些函数(a,b); //结果{颜色：[红色，蓝色]}

考虑到可能有任意数量的键，其值是任意长度的数组。请帮我找到完美的解决方案。

谢谢。

【问题讨论】：

标签： object intersection

【解决方案1】：

我的一位同事给了我以下功能，这正是我想要的。

//Making the assumption that all values are arrays.
//Probably a more efficient way of doing this.
const a = { color: ["red", "green", "blue"], fruits: ["apple", "banana"] };
const b = {color: ["red", "black", "blue"] };
console.log(someFucntion(a, b)); // result { color:[red, blue] }
function someFucntion(objOne, objTwo) {
    // Find intersecting keys and values and return them.
    let finalObj = {};
    // Only need to check one. If it isn't in here, it doesn't matter
    // if it is in the other.
    for (const key in objOne) {
        // Check if key is in other object.
        if (key in objTwo) {
            // Assumes all values are arrays.
            finalObj[key] = [];
            // Populate with shared values.
            objOne[key].forEach(el => {
                if (objTwo[key].includes(el)) {
                    finalObj[key].push(el);
                }
            });
        }
    }
    return finalObj;
}

【讨论】：