const Application = (() => {
  const privateVariable = 'Private content'
  const link = document.querySelector('.link')

  const _private = {
    cache: () => (this.link = document.querySelector('.link'))
    bind: () => this.link.addEventListener('click', this.shoshowContentwVariableContent, false),
    showContent: () => console.log(privateVariable)
  }

  return {
    init: () => {
      _private.showContent()
      _private.cache()
      _private.bind()
    }
  }
})()

Application.init() //
console.log(privateVariable) //undefined