import React , { memo } from 'react' ; import ButtonPref from './ButtonPref' ; import ButtonLangPref from './ButtonLangPref' ; import ButtonSgPref from './ButtonSgPref' ; import ButtonHelp from './ButtonHelp' ; import ButtonGithub from './ButtonGithub' ; import ButtonFullscreen from './ButtonFullscreen' ; const ButtonBar = ( ) => ( < div > < ButtonPref /> < ButtonLangPref / > < ButtonSgPref /> < ButtonFullscreen / > < ButtonHelp /> < ButtonGithub / > < /div>); export default memo ( ButtonBar ) ;