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
}
}
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);
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>
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
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>