Easy 2 point
            Medium 4 points
            Hard 6 points
            Ninja 10 points
| Question | Type | Level | Solve | 
|---|---|---|---|
| Write a function to sum the digits until you get 1 digit number? | Number | Medium | Solve | 
| Write a function to sort list of numbers according to chronological order of digits? | Array | Medium | Solve | 
| Write a function to check whether giving word is in all uppercase without using string functions? | Challenge | Medium | Solve | 
| Write a function to compute the length of the longest substring of a given string that contains at most two distinct characters? | String | Hard | Solve | 
| Write a JavaScript function to convert string to uppercase ignoring numbers? | String | Easy | Solve | 
| Write a JavaScript program to find the longest substring of unique characters (i.e., the longest substring where no character repeats? | String | Medium | Solve | 
| Write a function that takes a string and removes all characters except alphabets (A-Z, a-z) and digits (0-9)? | String | Hard | Solve | 
| Write a JavaScript function that takes a string as input and returns the longest substring without repeating characters? | String | Medium | Solve | 
| Write a function that checks whether a number is between 1 and 500? | Number | Easy | Solve | 
| Write a function that checks if a number is divisible by 4 or 6? | Number | Easy | Solve |