Show 'too much recursion' message
Add a puzzle to show recursion
Change puzzle to show recursion
Add a function to show anonymous function
Add a function to test greater than
Access properties
Access an object
Add a property that do not exist
Quote invalid variable property names
Use variables to name properties
Use operator 'in' object property
Set property name using a value
Compare object with two references and two objects with same properties
Create new array
Add a function which a show number in a range
Add properties that refer to function values
Add array methods
Show split method
Show difference between split and join in array
Use charAt to get certain character in a string