Android (Java)

• How to use Volley (REST API)
• Singleton explained
• Countdown timer
• Check battery level
• Send and receive broadcast
• JSON parsing with GSON
• What is setContentView?
• What is C2DM?

Javascript

• Array.filter made simple
• Array.map made simple
• Array.reduce made simple
• Chain filter, map and reduce

ReactJS

• Redux made simple (Coming soon)