新属性中的对象组数组

Question

[{date:'2017-8-1'},{date:'2017-8-2'},{date:'2017-8-3'},{date:'2017-8-5'},{date:'2017-8-6'},{date:'2017-8-7'},{date:'2017-8-8'},{date:'2017-8-9'}]

我有上面的数据，我试着把最后两个项目分组，给它一个属性‘周末’，剩下的是‘工作日’，我的预期输出如下

{
    weekdays: [{date:'2017-8-1'},{date:'2017-8-2'},{date:'2017-8-3'},{date:'2017-8-5'},{date:'2017-8-6'},{date:'2017-8-7'}],
    weekends: [{date:'2017-8-8'},{date:'2017-8-9'}]
}

我的尝试失败了

data.map((obj, i) => {

    if(data.length - (i + 1) >= 2) {
        return {
            weekdays: {
                date: moment(obj.date)
            }
        }
    }

    return {
        weekends: {
            date: moment(obj.date)
        }
    }
})

Answer 1

如果您不确定这些日子的顺序是什么，那么：

​

days = [{date:'2017-8-1'},{date:'2017-8-2'},{date:'2017-8-3'},{date:'2017-8-5'},{date:'2017-8-6'},{date:'2017-8-7'},{date:'2017-8-8'},{date:'2017-8-9'}]

const isWeekend = day => (
  [6, 0].includes(new Date(day.date).getDay())
);

const separate = (days) => {
  const weekends = [];
  const weekdays = [];
  days.forEach((day) => {
    isWeekend(day) ? weekends.push(day) : weekdays.push(day);
  });
  return { weekends, weekdays };
};

console.log(separate(days));

​

Answer 2

如果您确信周末总是输入数组中的最后两个元素，那么您可以使用一个简单的slice。

​

var inputArray = [{date:'2017-8-1'},{date:'2017-8-2'},{date:'2017-8-3'},{date:'2017-8-5'},{date:'2017-8-6'},{date:'2017-8-7'},{date:'2017-8-8'},{date:'2017-8-9'}],
outputArray = {
  weekdays: inputArray.slice(0,5),
  weekends: inputArray.slice(6)
};

console.log(outputArray);

​

Answer 3

可以将字符串转换为日期，然后使用.getDay()方法检查日期是哪一天。然后将其放入相应的数组中，如下所示：

​

var array = [{date:'2017-8-1'},{date:'2017-8-2'},{date:'2017-8-3'},{date:'2017-8-5'},{date:'2017-8-6'},{date:'2017-8-7'},{date:'2017-8-8'},{date:'2017-8-9'}];
var obj = {
    weekdays: [],
    weekends: []
};

array.forEach((el, key) => {
    if(new Date(el.date).getDay() === 0 || new Date(el.date).getDay() === 6) obj.weekends.push(el); else obj.weekdays.push(el);
});

console.log(obj);

​