LessonAbout 6 minLesson languageEnglishதமிழ் (Tamil)हिन्दी (Hindi)മലയാളം (Malayalam)తెలుగు (Telugu)ಕನ್ನಡ (Kannada)বাংলা (Bengali)मराठी (Marathi)ગુજરાતી (Gujarati)ਪੰਜਾਬੀ (Punjabi)Chapter 4 · Lesson 2 of 502. Showing and hiding: true or falseState can be true or false. Flip it with a button, and show or hide part of the page with && or ? :.