Add power function to check for errors
Add function to find string between string to check for errors
Modify function to find string between string
Add variable to test function between error-handling
Add function to check error in finding last element in array
Add modified function to check error
 in finding last element in array
Add processThing function
Add finally block to processThing function
Add error-handling to check exception in javascript
Add throw with new and Error keyword
Add function to determine true values of object and object stored in it