计算每个对象的长度属性. [英] Count length properties of each object.entry

问题描述

所以我希望能够计算数组中每个对象内的属性数量...

So I want to be able to count the number of properties within each object in an array...

    value = [
   0: { personId: "0003678", seniorStatus: "Yes", juniors: "maybe" }, //3
   1: { personId: "0001657", seniorStatus: "No", juniors: "No" }, //3
   2: { personId: "0002345", seniorStatus: "No", juniors: "No", infants: "Maybe" } //4

基本上，我想执行此操作以检查更改.如果任何对象中有3个以上的属性.我知道如何计算对象的数量，在这种情况下有3个.但是需要计算内部的属性.如果大于3，则返回true.

Basically I want to do this to check for a change. If more than 3 properties in any of the objects. I know how to count the number of objects, in this case there are 3. But need to count the properties within. If more than 3 return true.

我正在努力寻找超出对象问题计数范围之外的任何东西.我正在使用lodash(如果有用的话).

I am struggling to find anything that gets past the counting of Objects question. I am using lodash if useful for an answer.

推荐答案

将数组映射到每个对象的 Object.keys() 并检查是否大于3:

Map the array to the length of the Object.keys() of each object and check if greater than 3:

const values = [{"personId":"0003678","seniorStatus":"Yes","juniors":"maybe"},{"personId":"0001657","seniorStatus":"No","juniors":"No"},{"personId":"0002345","seniorStatus":"No","juniors":"No","infants":"Maybe"}]
   
const result = values.map(o => Object.keys(o).length > 3)

console.log(result)

或使用lodash的 _.size() 以获得每个对象中的属性数量，然后使用 <代码> _.lt() :

Or use lodash's _.size() to get the number of properties in each object, and then check if 3 is less than the number with _.lt():

const values = [{"personId":"0003678","seniorStatus":"Yes","juniors":"maybe"},{"personId":"0001657","seniorStatus":"No","juniors":"No"},{"personId":"0002345","seniorStatus":"No","juniors":"No","infants":"Maybe"}]
   
const result = values.map(_.flow(
  _.size,
  _.partial(_.lt, 3)
))

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.min.js"></script>

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