memo-switch

memo-switch

A switch that memorizes state transition events.

API Documentation

• The switch memorizes all the state transition events.
• From the events, we get state of any time point.

Install

npm install memo-switch

Usage

const MemoSwitch = require('memo-switch')

const memoSwitch = MemoSwitch.initialize()

console.log(memoSwitch.isActivated) // false
memoSwitch.toggle()
console.log(memoSwitch.isActivated) // true

for babel|flow users

// @flow
import MemoSwitch from 'memo-switch/jsnext'

This way, we can import the module and their type.

Get state of a time point

const memoSwitch = MemoSwitch.initialize()

const timestamp = new Date().getTime()
console.log(memoSwitch.isActivatedAt(timestamp)) // true

const minuteAgo = new Date().getTime() - 360000
console.log(memoSwitch.isActivatedAt(minuteAgo)) // false

Default state

Set default state to the 1st argument of MemoSwitch.initialize().

const memoSwitch = MemoSwitch.initialize(true)
console.log(memoSwitch.isActivated) // true

Time resolution

We can set time resolution of the events. Default resolution: MINUTE.

First, load the Resolutions constants.

const { Resolutions } = MemoSwitch

In ES modules,

import MemoSwitch, { Resolutions } from 'memo-switch'

Then, set at 2nd argument of MemoSwitch.initialize().

const memoSwitch = MemoSwitch.initialize(false, Resolutions.MILLISECOND)

Available resolutions

• MILLISECOND
• SECOND
• MINUTE
• HOUR
• DAY
• MONTH
• YEAR

Save/Restore the switch

Just stringify it.

const str = JSON.stringify(memoSwitch)

To restore, give the object to constructor.

const obj = JSON.parse(str)
const memoSwitch2 = new MemoSwitch(obj)

LICENSE

MIT