javascript – Lodash递归删除项目

前端之家收集整理的这篇文章主要介绍了javascript – Lodash递归删除项目前端之家小编觉得挺不错的,现在分享给大家,也给大家做个参考。
给定这个 JSON对象,lodash如何从对象中删除到达值?
{ 
    total: 350,SN1: { 
        reach: 200,engagementRate: 1.35
    },SN2: {
        reach: 150,engagementRate: 1.19
    }
}@H_404_3@ 
 

我一直试图迭代地删除()它但我总是得到一个未定义的对象作为回报所以我很肯定我做错了.
这也是我第一次使用lodash,这可能是实际问题.

有人可以帮忙吗?

解决方法

_.transform()将对象转换为另一个对象,并在将值传递给新对象时,检查该值是否为对象以及是否具有“reach”属性,如果是,则使用 _.omit()获取不到达的新对象:
var obj = {
  total: 350,SN1: {
    reach: 200,engagementRate: 1.35
  },SN2: {
    reach: 150,engagementRate: 1.19
  }
};

var result = _.transform(obj,function(result,value,key) {
  result[key] = _.isObject(value) && `reach` in value ? _.omit(value,'reach') : value;
});

console.log(result);@H_404_3@ 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>@H_404_3@ 
 

如果你需要一个处理多个嵌套对象级别的递归解决方案,这里是deepOmit,它使用相同的想法,但没有_.omit,可以用来删除多个键(参见代码中的注释):

var obj = {
  total: 350,engagementRate: 1.35,DEEP_SN1: {
      reach: 200,engagementRate: 1.35
    }
  },engagementRate: 1.19
  }
};

function deepOmit(obj,keysToOmit) {
  var keysToOmitIndex =  _.keyBy(Array.isArray(keysToOmit) ? keysToOmit : [keysToOmit] ); // create an index object of the keys that should be omitted

  function omitFromObject(obj) { // the inner function which will be called recursivley
    return _.transform(obj,key) { // transform to a new object
      if (key in keysToOmitIndex) { // if the key is in the index skip it
        return;
      }

      result[key] = _.isObject(value) ? omitFromObject(value) : value; // if the key is an object run it through the inner function - omitFromObject
    })
  }
  
  return omitFromObject(obj); // return the inner function result
}

console.log(deepOmit(obj,'reach')); // you can use a string for a single value

console.log(deepOmit(obj,['reach','engagementRate'])); // you can use an array of strings for multiple values@H_404_3@ 
 
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>@H_404_3@

猜你在找的JavaScript相关文章