lazywork code snippet

class LazyWork {
  constructor (context = window) {
    this._queue = []
    this.context = context
    window.setTimeout(_ => this._next(), 0)
  }

  _next () {
    let fn = this._queue.shift()
    fn && fn()
  }

  sleep (second = 0) {
    this._queue.push(_ => {
      window.setTimeout(_ => {
        this._next()
      }, second * 1000 | 0)
    })
    return this
  }

  after (sth) {
    this._queue.push(_ => {
      typeof sth === 'function'
        ? sth.call(this.context)
        : console.log(sth)
      this._next()
    })
    return this
  }

  before (sth) {
    this._queue.unshift(_ => {
      typeof sth === 'function'
        ? sth.call(this.context)
        : console.log(sth)
      this._next()
    })
    return this
  }
}