moment-date-range

Creates an generator to lazily loop over a date range using moment.

Requirements

• Node >= 8
• moment (Peer dependency)

If you use Typescript, Typescript 3.6+ is required since this lib uses the global generic Generator type.

Install

$ npm install @simonja/moment-date-range --save

Usage

With only start passed

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-21'));

for (const day of generator) {
    console.log(day.format('YYYY-MM-DD')) // 2020-01-21 -> Infinity
}

With start and end passed using the default configuration options passed

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-21'), moment('2020-01-31'));

for (const day of generator) {
    console.log(day.format('YYYY-MM-DD')) // 2020-01-21 -> 2020-01-31
}

With a start, end and configuration options

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-01'), moment('2020-01-05'), {step: 2, unit: 'd'});

for (const day of generator) {
    console.log(day.format('YYYY-MM-DD')) // 2020-01-01 -> 2020-01-03 -> 2020-01-05
}

Without lazy computation

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-01'), moment('2020-01-10'));

const dates = Array
    .from(generator)
    .map(item => item.format('YYYY-MM-DD'));

console.log(dates)

// ['2020-01-01',
// '2020-01-02',
// '2020-01-03',
// '2020-01-04',
// '2020-01-05',
// '2020-01-06',
// '2020-01-07',
// '2020-01-08',
// '2020-01-09',
// '2020-01-10']

With start and end with a negative step configuration

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-31'), moment('2020-01-29'), {step: -1});

for (const day of generator) {
    console.log(day.format('YYYY-MM-DD')) // 2020-01-31 -> 2020-01-30 -> 2020-01-29
}

With start and end with a defined unit

import {range} from '@simonja/moment-date-range';

const generator = range(moment('2020-01-01'), moment('2020-01-18'), {unit: 'w'});

for (const day of generator) {
    console.log(day.format('YYYY-MM-DD')) // 2020-01-01 -> 2020-01-08 -> 2020-01-15
}

API

range(start, [end], [options]) -> Generator

start

Type: moment object

Start of the date range

end

Type: moment object

End of the date range

options

Configuration options

options.step

Number of units between each iteration. Default 1

options.unit

Unit used during iteration for comparison and cycling. Default d

Generator

Result of the range function. Returns a generator that lazily creates moment objects.