计算在一个数组中找到但在另一个数组中没有的 Moment.js 范围数组

Question

Given the 2 arrays a and b containing moment ranges ,

const Moment = require('moment');
const MomentRange = require('moment-range');
const moment = MomentRange.extendMoment(Moment);

let a = [
    moment.range(moment('2020-01-01 09:00'), moment('2020-01-01 11:00')),
    moment.range(moment('2020-01-01 14:00'), moment('2020-01-01 18:00')),
    moment.range(moment('2020-01-01 20:00'), moment('2020-01-01 21:00')),
    moment.range(moment('2020-01-01 22:00'), moment('2020-01-01 23:00'))
];

let b = [
    moment.range(moment('2020-01-01 11:30'), moment('2020-01-01 13:00')),
    moment.range(moment('2020-01-01 17:00'), moment('2020-01-01 20:30')),
    moment.range(moment('2020-01-01 21:45'), moment('2020-01-01 23:15'))
];

How can we calculate an array c containing moment ranges that are found in b but not in a ?

For an example involving a and b , we want to get the result c , given by

let c = [
    moment.range(moment('2020-01-01 11:30'), moment('2020-01-01 13:00')),
    moment.range(moment('2020-01-01 18:00'), moment('2020-01-01 20:00')),
    moment.range(moment('2020-01-01 21:45'), moment('2020-01-01 22:00')),
    moment.range(moment('2020-01-01 23:00'), moment('2020-01-01 23:15'))
];

Using node v14.2.0, moment 2.27.0 and moment-range 4.0.2.

---

@Nikita-Iskorkin Running your code

let c = [];
b.forEach(range => {
    if (!a.includes(range))
        c.push(range)
})

gives the following result for c which does not exclude/subtract away the time ranges found in a :

[
  t {
    start: Moment<2020-01-01T11:30:00-05:00>,
    end: Moment<2020-01-01T13:00:00-05:00>
  },
  t {
    start: Moment<2020-01-01T17:00:00-05:00>,
    end: Moment<2020-01-01T20:30:00-05:00>
  },
  t {
    start: Moment<2020-01-01T21:45:00-05:00>,
    end: Moment<2020-01-01T23:15:00-05:00>
  }
]

The desired result c should be:

[
  t {
    start: Moment<2020-01-01T11:30:00-05:00>,
    end: Moment<2020-01-01T13:00:00-05:00>
  },
  t {
    start: Moment<2020-01-01T18:00:00-05:00>,
    end: Moment<2020-01-01T20:00:00-05:00>
  },
  t {
    start: Moment<2020-01-01T21:45:00-05:00>,
    end: Moment<2020-01-01T22:00:00-05:00>
  },
  t {
    start: Moment<2020-01-01T23:00:00-05:00>,
    end: Moment<2020-01-01T23:15:00-05:00>
  }

Answer 1

Just check in forEach-loop of array b that range doesn't contains in array a and push push it to c

const Moment = require('moment');
const MomentRange = require('moment-range');
const moment = MomentRange.extendMoment(Moment);

let a = [
    moment.range(moment('2020-01-01 09:00'), moment('2020-01-01 11:00')),
    moment.range(moment('2020-01-01 14:00'), moment('2020-01-01 18:00')),
    moment.range(moment('2020-01-01 20:00'), moment('2020-01-01 21:00')),
    moment.range(moment('2020-01-01 22:00'), moment('2020-01-01 23:00'))
];

let b = [
    moment.range(moment('2020-01-01 11:30'), moment('2020-01-01 13:00')),
    moment.range(moment('2020-01-01 17:00'), moment('2020-01-01 20:30')),
    moment.range(moment('2020-01-01 21:45'), moment('2020-01-01 23:15'))
];

let c = [];

b.forEach(range => {
    if (!a.includes(range))
        c.push(range)
})