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
基本上我想这样做来检查变化。如果任何对象中的属性超过 3 个。我知道如何计算对象的数量，在这种情况下有 3 个。但需要计算其中的属性。如果超过 3 则返回 true。
我正在努力寻找任何超越对象计数问题的东西。如果对答案有用，我正在使用 lodash。
将数组映射到Object.keys()每个对象的长度并检查是否大于 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's_.size()来获取每个对象中的属性数量，然后检查 3 是否小于数量_.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>将此视为Ori Drori方法的扩展。如果您需要获取具有多于N 个键的对象，您可以像这样使用filter()：
const input = [
{personId:"0003678", seniorStatus:"Yes", juniors:"maybe" },
{personId:"0001657", seniorStatus:"No", juniors:"No" },
{personId:"0002345", seniorStatus:"No", juniors:"No", infants:"Maybe"}
];
const filterObj = (objs, numProps) =>
{
return objs.filter(o => Object.keys(o).length > numProps);
}
console.log("Objs with more than 3 props: ", filterObj(input, 3));
console.log("Objs with more than 2 props: ", filterObj(input, 2));