javascript中对象的递归合并

Question

我目前正在处理一个带有 react 的项目，并且在使用 setState 方法时遇到合并两个对象的问题。我有两个类似的对象

person1 = {
    name: 'ramya',
    age: 21,
    gender: 'f',
    skills:{
        technicalSkills: {
            languages: ['C', 'C++', 'Java'],
            operatingSystems: ['Unix', 'Linux']
        },
        linguisticSkills: {
            toSpeak: ['English', 'Tamil'],
            toRead: ['English']
        }
    },
}

obj2 = {
    skills: {
        linguisticSkills: {
            toRead: ['English', 'Tamil']
        }
    }
}

我想将第 1 个人的 Skills.linguisticSkills 的状态更改为

linguisticSkills: {
                toSpeak: ['English', 'Tamil'],
                toRead: ['English', 'Tamil']
} 

skills.linguisticSkills.toSpeak并skills.linguisticSkills.toRead不断变化，即添加或删除项目。每当它发生变化时，我如何在 setState 中合并 person1 和 obj2 以便我最终处于正确的状态？

更新： _.merge 在这样的情况下失败：

person1 = {
        name: 'ramya',
        age: 21,
        gender: 'f',
        skills:{
            technicalSkills: {
                languages: ['C', 'C++', 'Java'],
                operatingSystems: ['Unix', 'Linux']
            },
            linguisticSkills: {
                toSpeak: ['English', 'Tamil'],
                toRead: ['English', 'Tamil', 'Telugu']
            }
        },
    }

    obj2 = {
        skills: {
            linguisticSkills: {
                toRead: ['English', 'Tamil']
            }
        }
    }

它给出与人 1 相同的结果，而

{
        name: 'ramya',
        age: 21,
        gender: 'f',
        skills:{
            technicalSkills: {
                languages: ['C', 'C++', 'Java'],
                operatingSystems: ['Unix', 'Linux']
            },
            linguisticSkills: {
                toSpeak: ['English', 'Tamil'],
                toRead: ['English', 'Tamil']
            }
        },
    }

是期待。

Answer 1

Lodash_.merge()是递归的。如果您需要对合并过程进行更精细的控制，可以使用_.mergeWith().

const person1 = {"name":"ramya","age":21,"gender":"f","skills":{"technicalSkills":{"languages":["C","C++","Java"],"operatingSystems":["Unix","Linux"]},"linguisticSkills":{"toSpeak":["English","Tamil"],"toRead":['English', 'Tamil', 'Telugu']}}}

const obj2 = {"skills":{"linguisticSkills":{"toRead":["English","Tamil"]}}}

const result = _.mergeWith({}, person1, obj2, (objValue, srcValue) => {
  if( _.isArray(srcValue)) {
    return srcValue;
  }
});

console.log(result);

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