Question

所以我希望能够计算数组中每个对象内的属性数量...

    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。

我正在努力寻找超出对象问题之外的任何东西。我正在使用lodash（如果有用的话）。

Answer 1

Map到每个对象的Object.keys()长度的数组，并检查是否大于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)

或者使用lodash的_.size()获取每个对象中的属性数量，然后检查3是否小于_.lt()的数量：

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>

Answer 2

将此作为 Ori Drori 方法的扩展。如果需要获取具有 N个键以上的对象，则可以像这样使用filter()：

na.omit

计算每个对象的长度属性。

2 个答案: